Alright, let's work through 5451 times 1978 step by step
5451 × 1978 = 1978 × (5451)
+ 1978 × 1 that is equal 1978
+ 1978 × 50 that equals 98900
+ 1978 × 400 that results in 791200
+ 1978 × 5000 resulting in 9890000

= 10782078
