We look at the division of 10907578 by 561 
The aim is to understand the frequency of 561 in 10907578.

Moving on to step 1:
If we divide 1 by 561, we get 0 and a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Include the next digit (0) from the dividend after 1, then repeat: 10 / 561

Going ahead to step 2:
The number 561 fits into 10 0 times, leaving a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 10, we get 10.
Include the next digit (9) from the dividend after 10, then repeat: 109 / 561

Advancing to step 3:
561 can be fit into 109 0 times, resulting in a remainder of 109.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 109 and we're left with 109.
Append the next digit (0) from the dividend to 109 and continue with: 1090 / 561

On to step 4:
561 can be fit into 1090 1 times, resulting in a remainder of 529.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 561 from 1090 to get 529.
Take the next digit (7) from the dividend and append it to 529, then repeat: 5297 / 561

Advancing to step 5:
The number 561 fits into 5297 9 times, leaving a remainder of 248.
Record the quotient 9 as the next digit in the result. 
Result so far: 19.0
If we take 5049 away from 5297, we end up with 248.
Include the next digit (5) from the dividend after 248, then repeat: 2485 / 561

Step 6:
561 goes into 2485 4 times with a remainder of 241.
Write down 4 as next digit of the result. 
Result so far: 194.0
Subtract 2244 from 2485 to get 241.
Fetch the next digit (7) from the dividend, attach it to 241 and continue: 2417 / 561

Advancing to step 7:
561 goes into 2417 4 times with a remainder of 173.
The next digit of our result is 4. 
Result so far: 1944.0
If we subtract 2244 from 2417, we get 173.
Append the next digit (8) from the dividend to 173 and continue with: 1738 / 561

Step 8:
If we divide 1738 by 561, we get 3 and a remainder of 55.
Use 3 as the next digit of our solution. 
Result so far: 19443.0
Subtracting 1683 from 1738 leaves us with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Let's proceed to step 9:
561 goes into 550 0 times with a remainder of 550.
Put 0 as the next digit of the answer. 
Result so far: 19443.0
If we subtract 0 from 550, we get 550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5500, and continue the process.

Moving on to step 10:
The number 561 fits into 5500 9 times, leaving a remainder of 451.
Use 9 as the next digit of our solution. 
Result so far: 19443.09
Deduct 5049 from 5500 and we're left with 451.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4510, and continue the process.

Let's proceed to step 11:
561 can be fit into 4510 8 times, resulting in a remainder of 22.
Put 8 as the next digit of the answer. 
Result so far: 19443.098
If we take 4488 away from 4510, we end up with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Advancing to step 12:
561 goes into 220 0 times with a remainder of 220.
Use 0 as the next digit of our solution. 
Result so far: 19443.098
The remainder is 220 after subtracting 0 from 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Advancing to step 13:
2200 divided by 561 is 3 with a remainder of 517.
Record the quotient 3 as the next digit in the result. 
Result so far: 19443.09803
If we take 1683 away from 2200, we end up with 517.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5170, and continue the process.

Step 14:
If we divide 5170 by 561, we get 9 and a remainder of 121.
The next digit of our result is 9. 
Result so far: 19443.098039
Subtract 5049 from 5170 to get 121.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1210, and continue the process.

Let's proceed to step 15:
561 goes into 1210 2 times with a remainder of 88.
The next digit of our result is 2. 
Result so far: 19443.0980392
Deduct 1122 from 1210 and we're left with 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

On to step 16:
561 goes into 880 1 times with a remainder of 319.
The next digit of our result is 1. 
Result so far: 19443.09803921
If we subtract 561 from 880, we get 319.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3190, and continue the process.

In conclusion, the division gives 19443.09803921 with a balance of 3.19e-07.