We look at the division of 99521807 by 723 
The aim is to understand the frequency of 723 in 99521807.

Moving on to step 1:
If we divide 9 by 723, we get 0 and a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Include the next digit (9) from the dividend after 9, then repeat: 99 / 723

Let's proceed to step 2:
723 can be fit into 99 0 times, resulting in a remainder of 99.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 99 and we're left with 99.
Take the next digit (5) from the dividend and append it to 99, then repeat: 995 / 723

Moving on to step 3:
When dividing 995 by 723, we get 1 with a remainder of 272.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 723 from 995 leaves us with 272.
Append the next digit (2) from the dividend to 272 and continue with: 2722 / 723

Let's proceed to step 4:
723 goes into 2722 3 times with a remainder of 553.
Put 3 as the next digit of the answer. 
Result so far: 13.0
The remainder is 553 after subtracting 2169 from 2722.
Include the next digit (1) from the dividend after 553, then repeat: 5531 / 723

Step 5:
723 goes into 5531 7 times with a remainder of 470.
Use 7 as the next digit of our solution. 
Result so far: 137.0
If we subtract 5061 from 5531, we get 470.
Grab the next digit (8) from the dividend, add it to 470, then carry on: 4708 / 723

On to step 6:
723 goes into 4708 6 times with a remainder of 370.
The next digit of our result is 6. 
Result so far: 1376.0
If we subtract 4338 from 4708, we get 370.
Append the next digit (0) from the dividend to 370 and continue with: 3700 / 723

Step 7:
3700 divided by 723 is 5 with a remainder of 85.
The number 5 becomes the next digit in our result. 
Result so far: 13765.0
Subtract 3615 from 3700 to get 85.
Take the next digit (7) from the dividend and append it to 85, then repeat: 857 / 723

On to step 8:
857 divided by 723 is 1 with a remainder of 134.
The next digit of our result is 1. 
Result so far: 137651.0
If we take 723 away from 857, we end up with 134.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1340, and continue the process.

Moving on to step 9:
1340 divided by 723 is 1 with a remainder of 617.
Use 1 as the next digit of our solution. 
Result so far: 137651.1
The remainder is 617 after subtracting 723 from 1340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6170, and continue the process.

Advancing to step 10:
723 can be fit into 6170 8 times, resulting in a remainder of 386.
Write down 8 as next digit of the result. 
Result so far: 137651.18
If we take 5784 away from 6170, we end up 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.

Going ahead to step 11:
723 goes into 3860 5 times with a remainder of 245.
The next digit of our result is 5. 
Result so far: 137651.185
If we subtract 3615 from 3860, we get 245.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2450, and continue the process.

Advancing to step 12:
723 can be fit into 2450 3 times, resulting in a remainder of 281.
The next digit of our result is 3. 
Result so far: 137651.1853
Subtract 2169 from 2450 to get 281.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2810, and continue the process.

Moving on to step 13:
723 goes into 2810 3 times with a remainder of 641.
The number 3 becomes the next digit in our result. 
Result so far: 137651.18533
If we subtract 2169 from 2810, we get 641.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6410, and continue the process.

After the division, we end up with 137651.18533 and a remainder of 0.000641.