Alright, let's work through 3979 times 5102 step by step
3979 × 5102 = 5102 × (3979)
+ 5102 × 9 that results in 45918
+ 5102 × 70 that is equal 357140
+ 5102 × 900 that is equal 4591800
+ 5102 × 3000 that is equal 15306000

= 20300858
