Let's divide 18639968 by 428
We're looking to find how many times 428 goes into 18639968.

Step 1:
The number 428 fits into 1 0 times, leaving a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Append the next digit (8) from the dividend to 1 and continue with: 18 / 428

Going ahead to step 2:
The number 428 fits into 18 0 times, leaving a remainder of 18.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 18 leaves us with 18.
Fetch the next digit (6) from the dividend, attach it to 18 and continue: 186 / 428

Step 3:
428 goes into 186 0 times with a remainder of 186.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 186 to get 186.
Grab the next digit (3) from the dividend, add it to 186, then carry on: 1863 / 428

Let's proceed to step 4:
1863 divided by 428 is 4 with a remainder of 151.
Put 4 as the next digit of the answer. 
Result so far: 4.0
If we take 1712 away from 1863, we end up with 151.
Fetch the next digit (9) from the dividend, attach it to 151 and continue: 1519 / 428

Advancing to step 5:
The number 428 fits into 1519 3 times, leaving a remainder of 235.
Write down 3 as next digit of the result. 
Result so far: 43.0
If we subtract 1284 from 1519, we get 235.
Take the next digit (9) from the dividend and append it to 235, then repeat: 2359 / 428

Advancing to step 6:
428 can be fit into 2359 5 times, resulting in a remainder of 219.
The number 5 becomes the next digit in our result. 
Result so far: 435.0
Subtracting 2140 from 2359 leaves us with 219.
Append the next digit (6) from the dividend to 219 and continue with: 2196 / 428

Moving on to step 7:
2196 divided by 428 is 5 with a remainder of 56.
Use 5 as the next digit of our solution. 
Result so far: 4355.0
If we take 2140 away from 2196, we end up with 56.
Fetch the next digit (8) from the dividend, attach it to 56 and continue: 568 / 428

Step 8:
If we divide 568 by 428, we get 1 and a remainder of 140.
The number 1 becomes the next digit in our result. 
Result so far: 43551.0
Subtracting 428 from 568 leaves us with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Advancing to step 9:
The number 428 fits into 1400 3 times, leaving a remainder of 116.
Put 3 as the next digit of the answer. 
Result so far: 43551.3
If we subtract 1284 from 1400, we get 116.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1160, and continue the process.

Going ahead to step 10:
The number 428 fits into 1160 2 times, leaving a remainder of 304.
Record the quotient 2 as the next digit in the result. 
Result so far: 43551.32
The remainder is 304 after subtracting 856 from 1160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3040, and continue the process.

Advancing to step 11:
When dividing 3040 by 428, we get 7 with a remainder of 44.
Use 7 as the next digit of our solution. 
Result so far: 43551.327
Subtracting 2996 from 3040 leaves us with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Let's proceed to step 12:
440 divided by 428 is 1 with a remainder of 12.
Put 1 as the next digit of the answer. 
Result so far: 43551.3271
If we subtract 428 from 440, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 13:
When dividing 120 by 428, we get 0 with a remainder of 120.
Use 0 as the next digit of our solution. 
Result so far: 43551.3271
Subtract 0 from 120 to get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Going ahead to step 14:
428 goes into 1200 2 times with a remainder of 344.
Write down 2 as next digit of the result. 
Result so far: 43551.327102
The remainder is 344 after subtracting 856 from 1200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3440, and continue the process.

Step 15:
If we divide 3440 by 428, we get 8 and a remainder of 16.
Record the quotient 8 as the next digit in the result. 
Result so far: 43551.3271028
Subtract 3424 from 3440 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 16:
If we divide 160 by 428, we get 0 and a remainder of 160.
Record the quotient 0 as the next digit in the result. 
Result so far: 43551.3271028
Deduct 0 from 160 and we're left with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

The final result is 43551.3271028 with a remainder of 1.6e-07.