Calculate Tooltips

e175429 

Hi,

Assuming you have a fact table with columns/measures: Live, Question, and E-mail and each presumably a count per row, and a Date dimension table related to fact table.

I think your Measures on Y-axis are already something like:

Live  = SUM('table'[Live])

then your monthly total would be 

Monthly Total =
[Live] + [Question] + [E-mail]

and your Percent would be 

Live % = DIVIDE([Live], [Monthly Total])
Question % = DIVIDE([Question], [Monthly Total])
Email % = DIVIDE([E-mail], [Monthly Total])

For the tooltip, you may use ToolTip page instead of default tooltip. You can place either a matrix visual or Multi-card visual on the tooltip page. On my demo file it will show as below 

In case you need more about tooltip page you can refer to 

Create report tooltip pages in Power BI - Power BI | Microsoft Learn

Hope this answered your question:)