Forward rate: The formula below works if I'm calculating the forward rate from year 1 to year - or just forward rates one year apart. However, I would like to know if I can use this formula to calculate the forward rate for more than one year, e.g. for year 1 to year 3.

Given that the spot rate for year 1 is 2.9% and the spot rate for year 3 is 3.6%, how do I find the forward rate (3.9518%) using the formula?

(1 + YTM,)" fn-1-n = (1 + YTMn-1)n-1