Alright, let's work through 3874 times 138 step by step
3874 × 138 = 138 × (3874)
+ 138 × 4 what gives us 552
+ 138 × 70 that results in 9660
+ 138 × 800 yielding 110400
+ 138 × 3000 that results in 414000

= 534612
