With this formula in conditional formatting and applied to cell X2 with your requirements of 6.72 in W2 and 1.86 in X2 the cell is highlighted.
<table style="width: 96pt; border-collapse: collapse;" width="128" border="0" cellpadding="0" cellspacing="0"><colgroup><col style="width: 48pt;" width="64" span="2"></colgroup><tbody><tr style="height: 12.75pt;" height="17"><td style="border: 0.5pt solid windowtext; background-color: transparent; width: 48pt; height: 12.75pt;" class="xl65" width="64" height="17">6.72
</td><td style="border: 0.5pt solid windowtext; width: 48pt; font-family: Verdana; background: none repeat scroll 0% 0% rgb(79, 129, 189); color: black; font-size: 10pt; font-weight: 400; text-decoration: none;" id="td_post_2694307" class="xl65" width="64">1.86
</td></tr><tr style="height: 12.75pt;" height="17"><td style="border-width: medium 0.5pt 0.5pt; border-style: none solid solid; border-color: windowtext; background-color: transparent; height: 12.75pt;" class="xl65" height="17">6.72</td><td style="border-width: medium 0.5pt 0.5pt medium; border-style: none solid solid none; border-color: windowtext; background-color: transparent;" class="xl65">4</td></tr><tr style="height: 12.75pt;" height="17"><td style="border-width: medium 0.5pt 0.5pt; border-style: none solid solid; border-color: windowtext; background-color: transparent; height: 12.75pt;" class="xl65" height="17">8</td><td style="border-width: medium 0.5pt 0.5pt medium; border-style: none solid solid none; border-color: windowtext; background-color: transparent;" class="xl65">1.86</td></tr><tr style="height: 12.75pt;" height="17"><td style="border-width: medium 0.5pt 0.5pt; border-style: none solid solid; border-color: windowtext; background-color: transparent; height: 12.75pt;" class="xl65" height="17">
</td><td style="border-width: medium 0.5pt 0.5pt medium; border-style: none solid solid none; border-color: windowtext; background-color: transparent;" class="xl65">1.86</td></tr><tr style="height: 12.75pt;" height="17"><td style="border-width: medium 0.5pt 0.5pt; border-style: none solid solid; border-color: windowtext; background-color: transparent; height: 12.75pt;" class="xl65" height="17">6.72</td><td style="border-width: medium 0.5pt 0.5pt medium; border-style: none solid solid none; border-color: windowtext; background-color: transparent;" class="xl65">
</td></tr></tbody></table>
What about this is not right? With the table above what should the results be?