We look at the division of 12592169 by 421 
Let's see how many times 421 fits into 12592169.

Advancing to step 1:
421 goes into 1 0 times with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 421

Let's proceed to step 2:
If we divide 12 by 421, we get 0 and a remainder of 12.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 12 and we're left with 12.
Take the next digit (5) from the dividend and append it to 12, then repeat: 125 / 421

Moving on to step 3:
421 can be fit into 125 0 times, resulting in a remainder of 125.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 125, we end up with 125.
Grab the next digit (9) from the dividend, add it to 125, then carry on: 1259 / 421

Going ahead to step 4:
421 can be fit into 1259 2 times, resulting in a remainder of 417.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we subtract 842 from 1259, we get 417.
Include the next digit (2) from the dividend after 417, then repeat: 4172 / 421

On to step 5:
When dividing 4172 by 421, we get 9 with a remainder of 383.
The number 9 becomes the next digit in our result. 
Result so far: 29.0
If we subtract 3789 from 4172, we get 383.
Append the next digit (1) from the dividend to 383 and continue with: 3831 / 421

Step 6:
When dividing 3831 by 421, we get 9 with a remainder of 42.
Put 9 as the next digit of the answer. 
Result so far: 299.0
Deduct 3789 from 3831 and we're left with 42.
Append the next digit (6) from the dividend to 42 and continue with: 426 / 421

Moving on to step 7:
The number 421 fits into 426 1 times, leaving a remainder of 5.
The next digit of our result is 1. 
Result so far: 2991.0
Deduct 421 from 426 and we're left with 5.
Take the next digit (9) from the dividend and append it to 5, then repeat: 59 / 421

On to step 8:
The number 421 fits into 59 0 times, leaving a remainder of 59.
Write down 0 as next digit of the result. 
Result so far: 29910.0
The remainder is 59 after subtracting 0 from 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Advancing to step 9:
The number 421 fits into 590 1 times, leaving a remainder of 169.
Use 1 as the next digit of our solution. 
Result so far: 29910.1
Subtract 421 from 590 to get 169.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1690, and continue the process.

Let's proceed to step 10:
1690 divided by 421 is 4 with a remainder of 6.
The next digit of our result is 4. 
Result so far: 29910.14
Subtracting 1684 from 1690 leaves us 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.

Step 11:
60 divided by 421 is 0 with a remainder of 60.
The number 0 becomes the next digit in our result. 
Result so far: 29910.14
Subtracting 0 from 60 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 12:
When dividing 600 by 421, we get 1 with a remainder of 179.
Record the quotient 1 as the next digit in the result. 
Result so far: 29910.1401
Subtracting 421 from 600 leaves us with 179.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1790, and continue the process.

Advancing to step 13:
When dividing 1790 by 421, we get 4 with a remainder of 106.
Put 4 as the next digit of the answer. 
Result so far: 29910.14014
Deduct 1684 from 1790 and we're left with 106.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1060, and continue the process.

Going ahead to step 14:
When dividing 1060 by 421, we get 2 with a remainder of 218.
Use 2 as the next digit of our solution. 
Result so far: 29910.140142
Subtract 842 from 1060 to get 218.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2180, and continue the process.

Moving on to step 15:
The number 421 fits into 2180 5 times, leaving a remainder of 75.
Record the quotient 5 as the next digit in the result. 
Result so far: 29910.1401425
Deduct 2105 from 2180 and we're left with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Step 16:
The number 421 fits into 750 1 times, leaving a remainder of 329.
The next digit of our result is 1. 
Result so far: 29910.14014251
If we take 421 away from 750, we end up with 329.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3290, and continue the process.

After the division, we end up with 29910.14014251 and a remainder of 3.29e-07.