My pleasure, Dave,
I suspected that a weighted average is what you are after. So, the three alternatives I can suggest are:
to export to Excel and calculate the n
umber manually as needed (crude, but effective), or
to leverage our Magic Reports solution to create a tailored report that meets your need (precise but restricted), or
to leverage our UberCalc solution to automatically calculate and store the desired total in a custom parameter at the Project (and/or Portfolio, etc) level so that you can then use it in your own Workfront Reports (most flexible)
If you'd like more information on either of the latter two, please email me at email@example.com.