We look at the division of 45891617 by 723 
The aim is to understand the frequency of 723 in 45891617.

Step 1:
4 divided by 723 is 0 with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Include the next digit (5) from the dividend after 4, then repeat: 45 / 723

Going ahead to step 2:
45 divided by 723 is 0 with a remainder of 45.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 45, we end up with 45.
Fetch the next digit (8) from the dividend, attach it to 45 and continue: 458 / 723

Moving on to step 3:
723 can be fit into 458 0 times, resulting in a remainder of 458.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 458 leaves us with 458.
Bring next digit (9) of the dividend behind the 458 and repeat the process: 4589 / 723

Moving on to step 4:
723 can be fit into 4589 6 times, resulting in a remainder of 251.
Use 6 as the next digit of our solution. 
Result so far: 6.0
If we take 4338 away from 4589, we end up with 251.
Fetch the next digit (1) from the dividend, attach it to 251 and continue: 2511 / 723

Moving on to step 5:
The number 723 fits into 2511 3 times, leaving a remainder of 342.
The number 3 becomes the next digit in our result. 
Result so far: 63.0
If we subtract 2169 from 2511, we get 342.
Include the next digit (6) from the dividend after 342, then repeat: 3426 / 723

Moving on to step 6:
When dividing 3426 by 723, we get 4 with a remainder of 534.
The next digit of our result is 4. 
Result so far: 634.0
Deduct 2892 from 3426 and we're left with 534.
Take the next digit (1) from the dividend and append it to 534, then repeat: 5341 / 723

On to step 7:
The number 723 fits into 5341 7 times, leaving a remainder of 280.
The next digit of our result is 7. 
Result so far: 6347.0
If we subtract 5061 from 5341, we get 280.
Take the next digit (7) from the dividend and append it to 280, then repeat: 2807 / 723

Step 8:
If we divide 2807 by 723, we get 3 and a remainder of 638.
Record the quotient 3 as the next digit in the result. 
Result so far: 63473.0
Subtracting 2169 from 2807 leaves us with 638.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6380, and continue the process.

Let's proceed to step 9:
6380 divided by 723 is 8 with a remainder of 596.
Record the quotient 8 as the next digit in the result. 
Result so far: 63473.8
Subtract 5784 from 6380 to get 596.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5960, and continue the process.

Going ahead to step 10:
723 goes into 5960 8 times with a remainder of 176.
Record the quotient 8 as the next digit in the result. 
Result so far: 63473.88
If we take 5784 away from 5960, we end up with 176.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1760, and continue the process.

After the division, we end up with 63473.88 and a remainder of 0.176.