Formula Field Question

I need to setup a formula cell to do a very simple calculation, but I can't get it to work.

Here's what I need to do:

Create a formula cell that Will automatically multiply one number with another.

Lookup Provider Count ( from Cell in opportunities)
Multiply That By a Dollar Amount (From another Cell in opportunities)

Here's the formula I get by using the tool in ZOHO CRM.
==${Potentials.Provider Count}*${Potentials.Estimated Unit / Per-provider Amount}

I'm new at this, but I'm usually pretty good with formulas. If I could just see a couple sample formulas, I could figure this out, but it seems formulas are not used for this type of function?