At a certain temperature, the following reactions have the equilibrium constants shown.
- S(s) + O₂(g) ⇆ SO₂(g) Kc1 = 4.2 ×10⁵²
- 2S(s) + 3O₂(g) ⇆ 2SO₃(g) Kc₂ = 9.8 ×10¹²⁸

Calculate the equilibrium constant, Kc, for the following reaction at that temperature.
2SO₂(g)+ O₂(g) ⇆ 2SO₃(g)