Calculated field:
You can create a calculated field with an expression similar tot he following where ‘test’ is a parameter associated with a control, and ‘Forecasted Monthly Revenue’ is the field value that has to be shown in $ currency or percentage.
Please note that this might not format the values with separators. For example, the value would look like 2040000%, $20677 etc.
Conditional rendering.
This option involves creating two different pivot tables, layered one over the other and shown/hidden based on parameter control value selection. This would allow you additional customization of fields, separators etc so you can format the pivot table as per your requirement.
A sample and how to is provided in our demo central site here.