We divide 28138 by 72
The aim is to understand the frequency of 72 in 28138.

Step 1:
2 divided by 72 is 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Grab the next digit (8) from the dividend, add it to 2, then carry on: 28 / 72

Going ahead to step 2:
72 goes into 28 0 times with a remainder of 28.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 28 leaves us with 28.
Take the next digit (1) from the dividend and append it to 28, then repeat: 281 / 72

Moving on to step 3:
The number 72 fits into 281 3 times, leaving a remainder of 65.
Write down 3 as next digit of the result. 
Result so far: 3.0
The remainder is 65 after subtracting 216 from 281.
Bring next digit (3) of the dividend behind the 65 and repeat the process: 653 / 72

Step 4:
The number 72 fits into 653 9 times, leaving a remainder of 5.
Use 9 as the next digit of our solution. 
Result so far: 39.0
If we take 648 away from 653, we end up with 5.
Append the next digit (8) from the dividend to 5 and continue with: 58 / 72

Let's proceed to step 5:
If we divide 58 by 72, we get 0 and a remainder of 58.
Record the quotient 0 as the next digit in the result. 
Result so far: 390.0
Subtracting 0 from 58 leaves us with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Going ahead to step 6:
If we divide 580 by 72, we get 8 and a remainder of 4.
The number 8 becomes the next digit in our result. 
Result so far: 390.8
Subtracting 576 from 580 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 7:
72 goes into 40 0 times with a remainder of 40.
Use 0 as the next digit of our solution. 
Result so far: 390.8
Subtract 0 from 40 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 8:
When dividing 400 by 72, we get 5 with a remainder of 40.
The next digit of our result is 5. 
Result so far: 390.805
If we subtract 360 from 400, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 9:
72 can be fit into 400 5 times, resulting in a remainder of 40.
Put 5 as the next digit of the answer. 
Result so far: 390.8055
If we subtract 360 from 400, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

The final result is 390.8055 with a remainder of 0.0004.