Alright, let's work through 7158 times 3866 step by step
7158 × 3866 = 3866 × (7158)
+ 3866 × 8 yielding 30928
+ 3866 × 50 resulting in 193300
+ 3866 × 100 that results in 386600
+ 3866 × 7000 that is equal 27062000

= 27672828
