Alright, let's work through 5671 times 1458 step by step
5671 × 1458 = 1458 × (5671)
+ 1458 × 1 producing 1458
+ 1458 × 70 producing 102060
+ 1458 × 600 producing 874800
+ 1458 × 5000 giving us 7290000

= 8268318
