We're dividing 521166 by 43 
We want to divide 521166 by 43.

Step 1:
5 divided by 43 is 0 with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Bring next digit (2) of the dividend behind the 5 and repeat the process: 52 / 43

Advancing to step 2:
43 goes into 52 1 times with a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 43 from 52 leaves us with 9.
Take the next digit (1) from the dividend and append it to 9, then repeat: 91 / 43

Going ahead to step 3:
If we divide 91 by 43, we get 2 and a remainder of 5.
Write down 2 as next digit of the result. 
Result so far: 12.0
Deduct 86 from 91 and we're left with 5.
Include the next digit (1) from the dividend after 5, then repeat: 51 / 43

Step 4:
If we divide 51 by 43, we get 1 and a remainder of 8.
The next digit of our result is 1. 
Result so far: 121.0
Subtract 43 from 51 to get 8.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 43

Advancing to step 5:
The number 43 fits into 86 2 times, leaving a remainder of 0.
Record the quotient 2 as the next digit in the result. 
Result so far: 1212.0
Subtracting 86 from 86 leaves us with 0.
Append the next digit (6) from the dividend to 0 and continue with: 6 / 43

On to step 6:
When dividing 6 by 43, we get 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 12120.0
Deduct 0 from 6 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 7:
If we divide 60 by 43, we get 1 and a remainder of 17.
Put 1 as the next digit of the answer. 
Result so far: 12120.1
Deduct 43 from 60 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Step 8:
When dividing 170 by 43, we get 3 with a remainder of 41.
Use 3 as the next digit of our solution. 
Result so far: 12120.13
Subtracting 129 from 170 leaves us with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Step 9:
The number 43 fits into 410 9 times, leaving a remainder of 23.
The next digit of our result is 9. 
Result so far: 12120.139
Deduct 387 from 410 and we're left with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Let's proceed to step 10:
43 can be fit into 230 5 times, resulting in a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 12120.1395
Deduct 215 from 230 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 11:
The number 43 fits into 150 3 times, leaving a remainder of 21.
Record the quotient 3 as the next digit in the result. 
Result so far: 12120.13953
If we take 129 away from 150, we end up with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

On to step 12:
When dividing 210 by 43, we get 4 with a remainder of 38.
The next digit of our result is 4. 
Result so far: 12120.139534
Subtract 172 from 210 to get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Moving on to step 13:
If we divide 380 by 43, we get 8 and a remainder of 36.
Use 8 as the next digit of our solution. 
Result so far: 12120.1395348
Subtracting 344 from 380 leaves us with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 14:
If we divide 360 by 43, we get 8 and a remainder of 16.
The number 8 becomes the next digit in our result. 
Result so far: 12120.13953488
Subtracting 344 from 360 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

In conclusion, the division gives 12120.13953488 with a balance of 1.6e-08.