Alright, let's work through 6405 times 1178 step by step
6405 × 1178 = 1178 × (6405)
+ 1178 × 5 yielding 5890
+ 1178 × 00 giving us 0
+ 1178 × 400 which equals 471200
+ 1178 × 6000 which equals 7068000

= 7545090
