This is a time value of money problem... The formula to find the monthly payment needed to achieve a future value is:
PMT = FV [(r/n) ÷ ((1 + (r/n))nt - 1)], where
FV = $1,750,000
r = 7.1% = 0.071
n = 12
t = 25
Substituting the values into the formula--be careful of your use of parentheses--results in a payment of $2,126.33...