Alright, let's work through 3879 times 3159 step by step
3879 × 3159 = 3159 × (3879)
+ 3159 × 9 producing 28431
+ 3159 × 70 what gives us 221130
+ 3159 × 800 that is equal 2527200
+ 3159 × 3000 that is equal 9477000

= 12253761
