We look at the division of 403790 by 86 
The aim is to understand the frequency of 86 in 403790.

Advancing to step 1:
4 divided by 86 is 0 with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 86

Step 2:
86 can be fit into 40 0 times, resulting in a remainder of 40.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 40 and we're left with 40.
Include the next digit (3) from the dividend after 40, then repeat: 403 / 86

Going ahead to step 3:
86 can be fit into 403 4 times, resulting in a remainder of 59.
Write down 4 as next digit of the result. 
Result so far: 4.0
The remainder is 59 after subtracting 344 from 403.
Take the next digit (7) from the dividend and append it to 59, then repeat: 597 / 86

On to step 4:
The number 86 fits into 597 6 times, leaving a remainder of 81.
The number 6 becomes the next digit in our result. 
Result so far: 46.0
Deduct 516 from 597 and we're left with 81.
Grab the next digit (9) from the dividend, add it to 81, then carry on: 819 / 86

Moving on to step 5:
86 can be fit into 819 9 times, resulting in a remainder of 45.
Use 9 as the next digit of our solution. 
Result so far: 469.0
Subtract 774 from 819 to get 45.
Append the next digit (0) from the dividend to 45 and continue with: 450 / 86

Step 6:
86 goes into 450 5 times with a remainder of 20.
The next digit of our result is 5. 
Result so far: 4695.0
Deduct 430 from 450 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 7:
86 can be fit into 200 2 times, resulting in a remainder of 28.
Write down 2 as next digit of the result. 
Result so far: 4695.2
Subtract 172 from 200 to get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Let's proceed to step 8:
If we divide 280 by 86, we get 3 and a remainder of 22.
The next digit of our result is 3. 
Result so far: 4695.23
Subtract 258 from 280 to get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Moving on to step 9:
86 can be fit into 220 2 times, resulting in a remainder of 48.
Put 2 as the next digit of the answer. 
Result so far: 4695.232
If we subtract 172 from 220, we get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

On to step 10:
86 can be fit into 480 5 times, resulting in a remainder of 50.
Use 5 as the next digit of our solution. 
Result so far: 4695.2325
Deduct 430 from 480 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

On to step 11:
If we divide 500 by 86, we get 5 and a remainder of 70.
Record the quotient 5 as the next digit in the result. 
Result so far: 4695.23255
The remainder is 70 after subtracting 430 from 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Our division results in 4695.23255 with a remaining 7e-05.