Integration, Integrals, Calculus

[King of Salem]

I am trying to take a pair of waveforms from an oscilloscope, specifically a voltage waveform and a current waveform, that was acquired from the same source. I want to then multiply the the waveforms together and integrate the resulting product. I want to plot this 'integrated product' waveform obtained from the voltage & current waveforms so that I can see the energy over time.

Is there any way I can do this easily and accurately in Excel? I would have the oscilloscope do it all for me, but the scope I have that can perform this function for me is on the fritz and the one I have now will not support an integration math function.