The textbook says that the PV of $4514.89 for 20 years at 6% is $51785.46

When I calculate the following in my calculator:

PMT = 4514.89

N=20

I/YR=6

FV=0

Then compute PV - I get $51217.04?? Not $51785.46 as stated in the textbook?

I also get a different answer for Scenario 4.

Is anyone else having this problem?