Alright, let's work through 1987 times 9426 step by step
1987 × 9426 = 9426 × (1987)
+ 9426 × 7 giving us 65982
+ 9426 × 80 giving us 754080
+ 9426 × 900 which equals 8483400
+ 9426 × 1000 which equals 9426000

= 18729462
