We look at the division of 7861033 by 817 
The aim is to understand the frequency of 817 in 7861033.

On to step 1:
7 divided by 817 is 0 with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Append the next digit (8) from the dividend to 7 and continue with: 78 / 817

Step 2:
The number 817 fits into 78 0 times, leaving a remainder of 78.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 78 to get 78.
Fetch the next digit (6) from the dividend, attach it to 78 and continue: 786 / 817

On to step 3:
The number 817 fits into 786 0 times, leaving a remainder of 786.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 786 after subtracting 0 from 786.
Include the next digit (1) from the dividend after 786, then repeat: 7861 / 817

Step 4:
817 can be fit into 7861 9 times, resulting in a remainder of 508.
Write down 9 as next digit of the result. 
Result so far: 9.0
If we take 7353 away from 7861, we end up with 508.
Fetch the next digit (0) from the dividend, attach it to 508 and continue: 5080 / 817

Step 5:
817 can be fit into 5080 6 times, resulting in a remainder of 178.
The number 6 becomes the next digit in our result. 
Result so far: 96.0
The remainder is 178 after subtracting 4902 from 5080.
Include the next digit (3) from the dividend after 178, then repeat: 1783 / 817

Advancing to step 6:
The number 817 fits into 1783 2 times, leaving a remainder of 149.
The number 2 becomes the next digit in our result. 
Result so far: 962.0
Subtract 1634 from 1783 to get 149.
Bring next digit (3) of the dividend behind the 149 and repeat the process: 1493 / 817

Going ahead to step 7:
817 can be fit into 1493 1 times, resulting in a remainder of 676.
Record the quotient 1 as the next digit in the result. 
Result so far: 9621.0
If we take 817 away from 1493, we end up with 676.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6760, and continue the process.

Moving on to step 8:
If we divide 6760 by 817, we get 8 and a remainder of 224.
The number 8 becomes the next digit in our result. 
Result so far: 9621.8
If we subtract 6536 from 6760, we get 224.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2240, and continue the process.

Advancing to step 9:
2240 divided by 817 is 2 with a remainder of 606.
The number 2 becomes the next digit in our result. 
Result so far: 9621.82
The remainder is 606 after subtracting 1634 from 2240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6060, and continue the process.

Let's proceed to step 10:
6060 divided by 817 is 7 with a remainder of 341.
Put 7 as the next digit of the answer. 
Result so far: 9621.827
If we take 5719 away from 6060, we end up with 341.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3410, and continue the process.

Moving on to step 11:
3410 divided by 817 is 4 with a remainder of 142.
Put 4 as the next digit of the answer. 
Result so far: 9621.8274
Deduct 3268 from 3410 and we're left with 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 12:
The number 817 fits into 1420 1 times, leaving a remainder of 603.
Put 1 as the next digit of the answer. 
Result so far: 9621.82741
If we take 817 away from 1420, we end up with 603.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6030, and continue the process.

Advancing to step 13:
6030 divided by 817 is 7 with a remainder of 311.
Use 7 as the next digit of our solution. 
Result so far: 9621.827417
The remainder is 311 after subtracting 5719 from 6030.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3110, and continue the process.

On to step 14:
The number 817 fits into 3110 3 times, leaving a remainder of 659.
Record the quotient 3 as the next digit in the result. 
Result so far: 9621.8274173
Subtracting 2451 from 3110 leaves us with 659.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6590, and continue the process.

Going ahead to step 15:
The number 817 fits into 6590 8 times, leaving a remainder of 54.
Write down 8 as next digit of the result. 
Result so far: 9621.82741738
The remainder is 54 after subtracting 6536 from 6590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

The final outcome is 9621.82741738, with a leftover of 5.4e-08.