4208789 divided by 421 
Our goal is to divide 4208789 by 421.

On to step 1:
421 can be fit into 4 0 times, resulting in a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Grab the next digit (2) from the dividend, add it to 4, then carry on: 42 / 421

Let's proceed to step 2:
When dividing 42 by 421, we get 0 with a remainder of 42.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 42 leaves us with 42.
Append the next digit (0) from the dividend to 42 and continue with: 420 / 421

Moving on to step 3:
421 goes into 420 0 times with a remainder of 420.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 420 after subtracting 0 from 420.
Take the next digit (8) from the dividend and append it to 420, then repeat: 4208 / 421

Advancing to step 4:
If we divide 4208 by 421, we get 9 and a remainder of 419.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
The remainder is 419 after subtracting 3789 from 4208.
Include the next digit (7) from the dividend after 419, then repeat: 4197 / 421

On to step 5:
The number 421 fits into 4197 9 times, leaving a remainder of 408.
The number 9 becomes the next digit in our result. 
Result so far: 99.0
The remainder is 408 after subtracting 3789 from 4197.
Append the next digit (8) from the dividend to 408 and continue with: 4088 / 421

Let's proceed to step 6:
421 can be fit into 4088 9 times, resulting in a remainder of 299.
Use 9 as the next digit of our solution. 
Result so far: 999.0
Subtracting 3789 from 4088 leaves us with 299.
Grab the next digit (9) from the dividend, add it to 299, then carry on: 2999 / 421

Going ahead to step 7:
2999 divided by 421 is 7 with a remainder of 52.
Use 7 as the next digit of our solution. 
Result so far: 9997.0
Deduct 2947 from 2999 and we're left with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

On to step 8:
The number 421 fits into 520 1 times, leaving a remainder of 99.
The number 1 becomes the next digit in our result. 
Result so far: 9997.1
If we take 421 away from 520, we end up with 99.
Since there are no more digits in the dividend, we add a zero to the remainder making it 990, and continue the process.

Let's proceed to step 9:
990 divided by 421 is 2 with a remainder of 148.
The number 2 becomes the next digit in our result. 
Result so far: 9997.12
Deduct 842 from 990 and we're left with 148.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1480, and continue the process.

Let's proceed to step 10:
421 goes into 1480 3 times with a remainder of 217.
Put 3 as the next digit of the answer. 
Result so far: 9997.123
Subtract 1263 from 1480 to get 217.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2170, and continue the process.

On to step 11:
421 can be fit into 2170 5 times, resulting in a remainder of 65.
Use 5 as the next digit of our solution. 
Result so far: 9997.1235
Deduct 2105 from 2170 and we're left with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Step 12:
421 can be fit into 650 1 times, resulting in a remainder of 229.
Put 1 as the next digit of the answer. 
Result so far: 9997.12351
Subtracting 421 from 650 leaves us with 229.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2290, and continue the process.

Going ahead to step 13:
If we divide 2290 by 421, we get 5 and a remainder of 185.
The number 5 becomes the next digit in our result. 
Result so far: 9997.123515
If we take 2105 away from 2290, we end up with 185.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1850, and continue the process.

Step 14:
1850 divided by 421 is 4 with a remainder of 166.
Use 4 as the next digit of our solution. 
Result so far: 9997.1235154
Subtract 1684 from 1850 to get 166.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1660, and continue the process.

Advancing to step 15:
If we divide 1660 by 421, we get 3 and a remainder of 397.
Use 3 as the next digit of our solution. 
Result so far: 9997.12351543
If we subtract 1263 from 1660, we get 397.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3970, and continue the process.

After the division, we end up with 9997.12351543 and a remainder of 3.97e-07.