Alright, let's work through 3471 times 405 step by step
3471 × 405 = 405 × (3471)
+ 405 × 1 that results in 405
+ 405 × 70 giving us 28350
+ 405 × 400 giving us 162000
+ 405 × 3000 resulting in 1215000

= 1405755
