We're dividing 591637 by 43 
The aim is to understand the frequency of 43 in 591637.

Advancing to step 1:
When dividing 5 by 43, we get 0 with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Include the next digit (9) from the dividend after 5, then repeat: 59 / 43

Going ahead to step 2:
59 divided by 43 is 1 with a remainder of 16.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 43 from 59 to get 16.
Bring next digit (1) of the dividend behind the 16 and repeat the process: 161 / 43

Advancing to step 3:
43 goes into 161 3 times with a remainder of 32.
Use 3 as the next digit of our solution. 
Result so far: 13.0
If we subtract 129 from 161, we get 32.
Include the next digit (6) from the dividend after 32, then repeat: 326 / 43

Step 4:
When dividing 326 by 43, we get 7 with a remainder of 25.
Use 7 as the next digit of our solution. 
Result so far: 137.0
Subtract 301 from 326 to get 25.
Fetch the next digit (3) from the dividend, attach it to 25 and continue: 253 / 43

Going ahead to step 5:
43 goes into 253 5 times with a remainder of 38.
The number 5 becomes the next digit in our result. 
Result so far: 1375.0
The remainder is 38 after subtracting 215 from 253.
Bring next digit (7) of the dividend behind the 38 and repeat the process: 387 / 43

On to step 6:
43 goes into 387 9 times with a remainder of 0.
Record the quotient 9 as the next digit in the result. 
Result so far: 13759.0
If we subtract 387 from 387, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 7:
0 divided by 43 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 13759.0
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
43 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 13759.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 13759.0 with a remainder of 0.0.