Create a calculation adding the three measures.
Add the new field to the length slot:
Apply sorting:
Now move the Measure Total calc to the Tooltip slot:
Note that I set the formatting on the calculation so it appears as currency.
Normally the tooltip slot doesn't allow sorting:
But the reason this works is the data item JSON isn't cleansed when moving from the Length to Tooltip slot. If you look at the underlying JSON (ctrl q /) you'll see this:
The definition for the item in the slot includes the sorting. If you're comfortable with the risk of breaking things, you can actually update the JSON directly with sorting and similar things on items that don't normally support it.