We're dividing 81138648 by 574 
The aim is to understand the frequency of 574 in 81138648.

Moving on to step 1:
574 can be fit into 8 0 times, resulting in a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 574

Step 2:
574 goes into 81 0 times with a remainder of 81.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 81 leaves us with 81.
Fetch the next digit (1) from the dividend, attach it to 81 and continue: 811 / 574

Let's proceed to step 3:
If we divide 811 by 574, we get 1 and a remainder of 237.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 574 from 811 leaves us with 237.
Grab the next digit (3) from the dividend, add it to 237, then carry on: 2373 / 574

Moving on to step 4:
574 goes into 2373 4 times with a remainder of 77.
Put 4 as the next digit of the answer. 
Result so far: 14.0
The remainder is 77 after subtracting 2296 from 2373.
Grab the next digit (8) from the dividend, add it to 77, then carry on: 778 / 574

Advancing to step 5:
778 divided by 574 is 1 with a remainder of 204.
Use 1 as the next digit of our solution. 
Result so far: 141.0
Subtract 574 from 778 to get 204.
Append the next digit (6) from the dividend to 204 and continue with: 2046 / 574

On to step 6:
The number 574 fits into 2046 3 times, leaving a remainder of 324.
The next digit of our result is 3. 
Result so far: 1413.0
Deduct 1722 from 2046 and we're left with 324.
Take the next digit (4) from the dividend and append it to 324, then repeat: 3244 / 574

Step 7:
574 can be fit into 3244 5 times, resulting in a remainder of 374.
Put 5 as the next digit of the answer. 
Result so far: 14135.0
Subtracting 2870 from 3244 leaves us with 374.
Grab the next digit (8) from the dividend, add it to 374, then carry on: 3748 / 574

Moving on to step 8:
If we divide 3748 by 574, we get 6 and a remainder of 304.
Put 6 as the next digit of the answer. 
Result so far: 141356.0
Deduct 3444 from 3748 and we're left with 304.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3040, and continue the process.

Step 9:
If we divide 3040 by 574, we get 5 and a remainder of 170.
Record the quotient 5 as the next digit in the result. 
Result so far: 141356.5
If we subtract 2870 from 3040, we get 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

On to step 10:
574 goes into 1700 2 times with a remainder of 552.
Put 2 as the next digit of the answer. 
Result so far: 141356.52
If we subtract 1148 from 1700, we get 552.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5520, and continue the process.

Advancing to step 11:
When dividing 5520 by 574, we get 9 with a remainder of 354.
Use 9 as the next digit of our solution. 
Result so far: 141356.529
The remainder is 354 after subtracting 5166 from 5520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3540, and continue the process.

Let's proceed to step 12:
3540 divided by 574 is 6 with a remainder of 96.
The number 6 becomes the next digit in our result. 
Result so far: 141356.5296
If we take 3444 away from 3540, we end up with 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Going ahead to step 13:
960 divided by 574 is 1 with a remainder of 386.
Write down 1 as next digit of the result. 
Result so far: 141356.52961
Subtracting 574 from 960 leaves us with 386.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3860, and continue the process.

On to step 14:
574 can be fit into 3860 6 times, resulting in a remainder of 416.
The next digit of our result is 6. 
Result so far: 141356.529616
If we take 3444 away from 3860, we end up with 416.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4160, and continue the process.

On to step 15:
If we divide 4160 by 574, we get 7 and a remainder of 142.
Use 7 as the next digit of our solution. 
Result so far: 141356.5296167
If we subtract 4018 from 4160, we get 142.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1420, and continue the process.

Moving on to step 16:
1420 divided by 574 is 2 with a remainder of 272.
The number 2 becomes the next digit in our result. 
Result so far: 141356.52961672
If we subtract 1148 from 1420, we get 272.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2720, and continue the process.

The final outcome is 141356.52961672, with a leftover of 2.72e-07.