No problem, we've got 2870 and 4087 to multiply
2870 × 4087 = 4087 × (2870)
+ 4087 × 0 that is equal 0
+ 4087 × 70 what gives us 286090
+ 4087 × 800 which equals 3269600
+ 4087 × 2000 yielding 8174000

= 11729690
