We look at the division of 21093662 by 436 
Let's see how many times 436 fits into 21093662.

Advancing to step 1:
436 goes into 2 0 times with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 436

Step 2:
436 can be fit into 21 0 times, resulting in a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Include the next digit (0) from the dividend after 21, then repeat: 210 / 436

Going ahead to step 3:
436 goes into 210 0 times with a remainder of 210.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 210 and we're left with 210.
Bring next digit (9) of the dividend behind the 210 and repeat the process: 2109 / 436

On to step 4:
2109 divided by 436 is 4 with a remainder of 365.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
Subtract 1744 from 2109 to get 365.
Include the next digit (3) from the dividend after 365, then repeat: 3653 / 436

Let's proceed to step 5:
When dividing 3653 by 436, we get 8 with a remainder of 165.
The number 8 becomes the next digit in our result. 
Result so far: 48.0
The remainder is 165 after subtracting 3488 from 3653.
Take the next digit (6) from the dividend and append it to 165, then repeat: 1656 / 436

Going ahead to step 6:
When dividing 1656 by 436, we get 3 with a remainder of 348.
The next digit of our result is 3. 
Result so far: 483.0
The remainder is 348 after subtracting 1308 from 1656.
Take the next digit (6) from the dividend and append it to 348, then repeat: 3486 / 436

Going ahead to step 7:
3486 divided by 436 is 7 with a remainder of 434.
Put 7 as the next digit of the answer. 
Result so far: 4837.0
Subtract 3052 from 3486 to get 434.
Append the next digit (2) from the dividend to 434 and continue with: 4342 / 436

Going ahead to step 8:
436 goes into 4342 9 times with a remainder of 418.
The next digit of our result is 9. 
Result so far: 48379.0
If we take 3924 away from 4342, we end up with 418.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4180, and continue the process.

On to step 9:
If we divide 4180 by 436, we get 9 and a remainder of 256.
The number 9 becomes the next digit in our result. 
Result so far: 48379.9
If we take 3924 away from 4180, we end up with 256.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

Let's proceed to step 10:
436 can be fit into 2560 5 times, resulting in a remainder of 380.
Record the quotient 5 as the next digit in the result. 
Result so far: 48379.95
Deduct 2180 from 2560 and we're left with 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

Step 11:
436 can be fit into 3800 8 times, resulting in a remainder of 312.
Use 8 as the next digit of our solution. 
Result so far: 48379.958
Deduct 3488 from 3800 and we're left with 312.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3120, and continue the process.

Step 12:
436 can be fit into 3120 7 times, resulting in a remainder of 68.
The next digit of our result is 7. 
Result so far: 48379.9587
If we take 3052 away from 3120, we end up with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Let's proceed to step 13:
When dividing 680 by 436, we get 1 with a remainder of 244.
The next digit of our result is 1. 
Result so far: 48379.95871
The remainder is 244 after subtracting 436 from 680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2440, and continue the process.

Let's proceed to step 14:
436 goes into 2440 5 times with a remainder of 260.
Record the quotient 5 as the next digit in the result. 
Result so far: 48379.958715
Deduct 2180 from 2440 and we're left with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Going ahead to step 15:
2600 divided by 436 is 5 with a remainder of 420.
Record the quotient 5 as the next digit in the result. 
Result so far: 48379.9587155
If we subtract 2180 from 2600, we get 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4200, and continue the process.

In conclusion, the division gives 48379.9587155 with a balance of 4.2e-06.