Alright, let's work through 1786 times 507 step by step
1786 × 507 = 507 × (1786)
+ 507 × 6 giving us 3042
+ 507 × 80 giving us 40560
+ 507 × 700 giving us 354900
+ 507 × 1000 giving us 507000

= 905502
