78453 ÷ 7 = 11207 R4
Alright, let's work through the division of 78453 by 7 step by step.

Step 1:
7 goes into 7 1 times with a remainder of 0.
Write down 1 as next digit of of the result. 
Result so far: 1
Subtract 7 from 7 to get 0.
Bring next digit (8) of the dividend behind the 0 and repeat the process: 8 / 7

Step 2:
7 goes into 8 1 times with a remainder of 1.
Write down 1 as next digit of of the result. 
Result so far: 11
Subtract 7 from 8 to get 1.
Bring next digit (4) of the dividend behind the 1 and repeat the process: 14 / 7

Step 3:
7 goes into 14 2 times with a remainder of 0.
Write down 2 as next digit of of the result. 
Result so far: 112
Subtract 14 from 14 to get 0.
Bring next digit (5) of the dividend behind the 0 and repeat the process: 5 / 7

Step 4:
7 goes into 5 0 times with a remainder of 5.
Write down 0 as next digit of of the result. 
Result so far: 1120
Subtract 0 from 5 to get 5.
Bring next digit (3) of the dividend behind the 5 and repeat the process: 53 / 7

Step 5:
7 goes into 53 7 times with a remainder of 4.
Write down 7 as next digit of of the result. 
Result so far: 11207
Subtract 49 from 53 to get 4.

The final result is 11207 with a remainder of 4.