Alright, let's work through 3126 times 4087 step by step
3126 × 4087 = 4087 × (3126)
+ 4087 × 6 what gives us 24522
+ 4087 × 20 giving us 81740
+ 4087 × 100 yielding 408700
+ 4087 × 3000 which equals 12261000

= 12775962
