The question and solution is there in the image..Could you please explain the last block of the answer..And the eqn used here

Equity Investments for infinite periods Phoenix produces dividends in 3 consecutive years of 0.00,0.31, and 0.65 , respectively. The dividend in Year 4 is estimated to be 0.67 and should grow in perpetuity at 4%. Given a discount rate of 10%, what is the price of the stock? PV=(1+0.1)1$0.00+(1+0.1)20.31+(1+0.1)30.65+[(1+0.1)31(0.100.04)$0.67]=$9.13