Alright, let's work through 4290 times 906 step by step
4290 × 906 = 906 × (4290)
+ 906 × 0 which equals 0
+ 906 × 90 producing 81540
+ 906 × 200 that equals 181200
+ 906 × 4000 yielding 3624000

= 3886740
