We're dividing 21015428 by 579 
Our goal is to divide 21015428 by 579.

Moving on to step 1:
If we divide 2 by 579, we get 0 and a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 579

Advancing to step 2:
579 can be fit into 21 0 times, resulting in a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Fetch the next digit (0) from the dividend, attach it to 21 and continue: 210 / 579

Moving on to step 3:
If we divide 210 by 579, we get 0 and a remainder of 210.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 210, we end up with 210.
Bring next digit (1) of the dividend behind the 210 and repeat the process: 2101 / 579

Going ahead to step 4:
579 goes into 2101 3 times with a remainder of 364.
The next digit of our result is 3. 
Result so far: 3.0
The remainder is 364 after subtracting 1737 from 2101.
Grab the next digit (5) from the dividend, add it to 364, then carry on: 3645 / 579

Step 5:
579 goes into 3645 6 times with a remainder of 171.
Write down 6 as next digit of the result. 
Result so far: 36.0
If we subtract 3474 from 3645, we get 171.
Bring next digit (4) of the dividend behind the 171 and repeat the process: 1714 / 579

Going ahead to step 6:
579 goes into 1714 2 times with a remainder of 556.
The next digit of our result is 2. 
Result so far: 362.0
If we subtract 1158 from 1714, we get 556.
Bring next digit (2) of the dividend behind the 556 and repeat the process: 5562 / 579

Moving on to step 7:
If we divide 5562 by 579, we get 9 and a remainder of 351.
Put 9 as the next digit of the answer. 
Result so far: 3629.0
Subtract 5211 from 5562 to get 351.
Take the next digit (8) from the dividend and append it to 351, then repeat: 3518 / 579

On to step 8:
3518 divided by 579 is 6 with a remainder of 44.
Write down 6 as next digit of the result. 
Result so far: 36296.0
If we subtract 3474 from 3518, we get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Advancing to step 9:
579 goes into 440 0 times with a remainder of 440.
Record the quotient 0 as the next digit in the result. 
Result so far: 36296.0
Subtracting 0 from 440 leaves us with 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

Let's proceed to step 10:
579 can be fit into 4400 7 times, resulting in a remainder of 347.
Use 7 as the next digit of our solution. 
Result so far: 36296.07
Deduct 4053 from 4400 and we're left with 347.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3470, and continue the process.

Going ahead to step 11:
579 can be fit into 3470 5 times, resulting in a remainder of 575.
Use 5 as the next digit of our solution. 
Result so far: 36296.075
If we subtract 2895 from 3470, we get 575.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5750, and continue the process.

On to step 12:
When dividing 5750 by 579, we get 9 with a remainder of 539.
Use 9 as the next digit of our solution. 
Result so far: 36296.0759
Subtracting 5211 from 5750 leaves us with 539.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5390, and continue the process.

Going ahead to step 13:
If we divide 5390 by 579, we get 9 and a remainder of 179.
Use 9 as the next digit of our solution. 
Result so far: 36296.07599
If we take 5211 away from 5390, we end up 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.

The final outcome is 36296.07599, with a leftover of 0.000179.