Alright, let's work through 7787 times 5455 step by step
7787 × 5455 = 5455 × (7787)
+ 5455 × 7 that is equal 38185
+ 5455 × 80 which equals 436400
+ 5455 × 700 which equals 3818500
+ 5455 × 7000 that is equal 38185000

= 42478085
