Each year price of your house will be increased in 1.07 times, because you have to add to price of house (100%) increasing percent (7%) and then you obtain the new price, which will be 107%=1.07.
After 21 years the price will be increased in [tex](1.07)^{21}[/tex] times and become [tex]$179,313\cdot (1.07)^{21}=\$742,457[/tex].
Answer: in 21 years the price of the house will be worth $742,457.
