8437590 divided by 726 
The aim is to understand the frequency of 726 in 8437590.

Going ahead to step 1:
The number 726 fits into 8 0 times, leaving a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Grab the next digit (4) from the dividend, add it to 8, then carry on: 84 / 726

On to step 2:
When dividing 84 by 726, we get 0 with a remainder of 84.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 84 leaves us with 84.
Grab the next digit (3) from the dividend, add it to 84, then carry on: 843 / 726

Let's proceed to step 3:
726 goes into 843 1 times with a remainder of 117.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 726 from 843 and we're left with 117.
Append the next digit (7) from the dividend to 117 and continue with: 1177 / 726

Let's proceed to step 4:
726 can be fit into 1177 1 times, resulting in a remainder of 451.
The next digit of our result is 1. 
Result so far: 11.0
The remainder is 451 after subtracting 726 from 1177.
Fetch the next digit (5) from the dividend, attach it to 451 and continue: 4515 / 726

Going ahead to step 5:
When dividing 4515 by 726, we get 6 with a remainder of 159.
Record the quotient 6 as the next digit in the result. 
Result so far: 116.0
If we take 4356 away from 4515, we end up with 159.
Take the next digit (9) from the dividend and append it to 159, then repeat: 1599 / 726

Step 6:
The number 726 fits into 1599 2 times, leaving a remainder of 147.
Put 2 as the next digit of the answer. 
Result so far: 1162.0
If we subtract 1452 from 1599, we get 147.
Take the next digit (0) from the dividend and append it to 147, then repeat: 1470 / 726

Advancing to step 7:
726 goes into 1470 2 times with a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 11622.0
Deduct 1452 from 1470 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 8:
The number 726 fits into 180 0 times, leaving a remainder of 180.
Put 0 as the next digit of the answer. 
Result so far: 11622.0
Subtract 0 from 180 to get 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Advancing to step 9:
726 can be fit into 1800 2 times, resulting in a remainder of 348.
Put 2 as the next digit of the answer. 
Result so far: 11622.02
Deduct 1452 from 1800 and we're left with 348.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3480, and continue the process.

Going ahead to step 10:
When dividing 3480 by 726, we get 4 with a remainder of 576.
Use 4 as the next digit of our solution. 
Result so far: 11622.024
The remainder is 576 after subtracting 2904 from 3480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5760, and continue the process.

Moving on to step 11:
726 goes into 5760 7 times with a remainder of 678.
Put 7 as the next digit of the answer. 
Result so far: 11622.0247
If we subtract 5082 from 5760, we get 678.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6780, and continue the process.

Going ahead to step 12:
When dividing 6780 by 726, we get 9 with a remainder of 246.
Write down 9 as next digit of the result. 
Result so far: 11622.02479
The remainder is 246 after subtracting 6534 from 6780.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2460, and continue the process.

Step 13:
2460 divided by 726 is 3 with a remainder of 282.
Use 3 as the next digit of our solution. 
Result so far: 11622.024793
Deduct 2178 from 2460 and we're left with 282.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2820, and continue the process.

Advancing to step 14:
726 can be fit into 2820 3 times, resulting in a remainder of 642.
Write down 3 as next digit of the result. 
Result so far: 11622.0247933
Subtract 2178 from 2820 to get 642.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6420, and continue the process.

The final outcome is 11622.0247933, with a leftover of 6.42e-06.