Alright, let's work through 4257 times 8390 step by step
4257 × 8390 = 8390 × (4257)
+ 8390 × 7 what gives us 58730
+ 8390 × 50 which equals 419500
+ 8390 × 200 resulting in 1678000
+ 8390 × 4000 that equals 33560000

= 35716230
