Alright, let's work through 4279 times 9917 step by step
4279 × 9917 = 9917 × (4279)
+ 9917 × 9 which equals 89253
+ 9917 × 70 producing 694190
+ 9917 × 200 that equals 1983400
+ 9917 × 4000 giving us 39668000

= 42434843
