PLEASE HELP Determine the value of the equilibrium constant, Kgoal, for the reaction

N2(g)+O2(g)+H2(g)⇌12N2H4(g)+NO2(g), Kgoal=?

by making use of the following information:

1. N2(g)+O2(g)⇌2NO(g), K1 = 4.10×10−31
2. N2(g)+2H2(g)⇌N2H4(g), K2 = 7.40×10−26
3. 2NO(g)+O2(g)⇌2NO2(g), K3 = 6.00×10−13
Express your answer numerically.