Weighted Average Excel - PivotTable

I need to calculate the weighted average of Channel 1 and 2 within the attached pivot table (bear in mind it has 3 levels/roll-ups). How can one accomplish this?
Thank you for your tremendous assistance.
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put this formula somewhere =SUMPRODUCT(B5:B19,C5:C19)/SUM(C5:C19)

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saved4useAuthor Commented:

I pasted that somewhere and it doesn't work. If you look at that pivot table, you will notice that the range does not end at B19 (fields are collapsed). I'm thinking this will take a calculated field/item within the pivot table. Any idea how to do that?
see plz attached.
saved4useAuthor Commented:
Still not what I'm looking for. Thanks.
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Microsoft Excel

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