Alright, let's work through 7787 times 480 step by step
7787 × 480 = 480 × (7787)
+ 480 × 7 yielding 3360
+ 480 × 80 yielding 38400
+ 480 × 700 which equals 336000
+ 480 × 7000 what gives us 3360000

= 3737760
