Good day Picers

A slightly off topic question?

I've got a Component that requires about 60mA from my PIC's PIN.

I'm trying to figure out how to use a PNP Transistor as a switch to get a greater current from my circuit?

I know that if you use different resistors it will give you different current from the Emitter to the collector.

Is there a formula to determine what size resistor to use to get a specific amount of current through the transistor?