We look at the division of 39087503 by 526 
The aim is to understand the frequency of 526 in 39087503.

On to step 1:
526 goes into 3 0 times with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Take the next digit (9) from the dividend and append it to 3, then repeat: 39 / 526

On to step 2:
If we divide 39 by 526, we get 0 and a remainder of 39.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 39 leaves us with 39.
Fetch the next digit (0) from the dividend, attach it to 39 and continue: 390 / 526

Moving on to step 3:
If we divide 390 by 526, we get 0 and a remainder of 390.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 390 to get 390.
Fetch the next digit (8) from the dividend, attach it to 390 and continue: 3908 / 526

Advancing to step 4:
526 can be fit into 3908 7 times, resulting in a remainder of 226.
The next digit of our result is 7. 
Result so far: 7.0
Deduct 3682 from 3908 and we're left with 226.
Fetch the next digit (7) from the dividend, attach it to 226 and continue: 2267 / 526

Let's proceed to step 5:
2267 divided by 526 is 4 with a remainder of 163.
Put 4 as the next digit of the answer. 
Result so far: 74.0
Subtracting 2104 from 2267 leaves us with 163.
Fetch the next digit (5) from the dividend, attach it to 163 and continue: 1635 / 526

Going ahead to step 6:
The number 526 fits into 1635 3 times, leaving a remainder of 57.
Put 3 as the next digit of the answer. 
Result so far: 743.0
If we subtract 1578 from 1635, we get 57.
Take the next digit (0) from the dividend and append it to 57, then repeat: 570 / 526

Let's proceed to step 7:
526 goes into 570 1 times with a remainder of 44.
The number 1 becomes the next digit in our result. 
Result so far: 7431.0
Subtracting 526 from 570 leaves us with 44.
Fetch the next digit (3) from the dividend, attach it to 44 and continue: 443 / 526

Let's proceed to step 8:
The number 526 fits into 443 0 times, leaving a remainder of 443.
Record the quotient 0 as the next digit in the result. 
Result so far: 74310.0
Subtracting 0 from 443 leaves us with 443.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4430, and continue the process.

Step 9:
4430 divided by 526 is 8 with a remainder of 222.
The next digit of our result is 8. 
Result so far: 74310.8
If we subtract 4208 from 4430, we get 222.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2220, and continue the process.

Advancing to step 10:
The number 526 fits into 2220 4 times, leaving a remainder of 116.
Write down 4 as next digit of the result. 
Result so far: 74310.84
If we subtract 2104 from 2220, we get 116.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1160, and continue the process.

Let's proceed to step 11:
526 goes into 1160 2 times with a remainder of 108.
Put 2 as the next digit of the answer. 
Result so far: 74310.842
Subtract 1052 from 1160 to get 108.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

Moving on to step 12:
If we divide 1080 by 526, we get 2 and a remainder of 28.
Record the quotient 2 as the next digit in the result. 
Result so far: 74310.8422
If we take 1052 away from 1080, we end up with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

After the division, we end up with 74310.8422 and a remainder of 0.00028.