We're dividing 4626738 by 721 
The aim is to understand the frequency of 721 in 4626738.

On to step 1:
721 can be fit into 4 0 times, resulting in a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Take the next digit (6) from the dividend and append it to 4, then repeat: 46 / 721

Step 2:
If we divide 46 by 721, we get 0 and a remainder of 46.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 46, we get 46.
Bring next digit (2) of the dividend behind the 46 and repeat the process: 462 / 721

Advancing to step 3:
The number 721 fits into 462 0 times, leaving a remainder of 462.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 462 and we're left with 462.
Take the next digit (6) from the dividend and append it to 462, then repeat: 4626 / 721

Moving on to step 4:
The number 721 fits into 4626 6 times, leaving a remainder of 300.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
If we take 4326 away from 4626, we end up with 300.
Bring next digit (7) of the dividend behind the 300 and repeat the process: 3007 / 721

Going ahead to step 5:
The number 721 fits into 3007 4 times, leaving a remainder of 123.
Put 4 as the next digit of the answer. 
Result so far: 64.0
If we subtract 2884 from 3007, we get 123.
Include the next digit (3) from the dividend after 123, then repeat: 1233 / 721

Going ahead to step 6:
If we divide 1233 by 721, we get 1 and a remainder of 512.
Put 1 as the next digit of the answer. 
Result so far: 641.0
Subtracting 721 from 1233 leaves us with 512.
Bring next digit (8) of the dividend behind the 512 and repeat the process: 5128 / 721

Going ahead to step 7:
If we divide 5128 by 721, we get 7 and a remainder of 81.
Use 7 as the next digit of our solution. 
Result so far: 6417.0
Subtract 5047 from 5128 to get 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Going ahead to step 8:
721 goes into 810 1 times with a remainder of 89.
The next digit of our result is 1. 
Result so far: 6417.1
Deduct 721 from 810 and we're left with 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

Let's proceed to step 9:
721 goes into 890 1 times with a remainder of 169.
The number 1 becomes the next digit in our result. 
Result so far: 6417.11
Subtract 721 from 890 to get 169.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1690, and continue the process.

The final outcome is 6417.11, with a leftover of 0.169.