Alright, let's work through 7872 times 3921 step by step
7872 × 3921 = 3921 × (7872)
+ 3921 × 2 that equals 7842
+ 3921 × 70 producing 274470
+ 3921 × 800 that results in 3136800
+ 3921 × 7000 yielding 27447000

= 30866112
