We're dividing 7280461 by 639 
The aim is to understand the frequency of 639 in 7280461.

Moving on to step 1:
7 divided by 639 is 0 with a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Bring next digit (2) of the dividend behind the 7 and repeat the process: 72 / 639

On to step 2:
The number 639 fits into 72 0 times, leaving a remainder of 72.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 72 and we're left with 72.
Take the next digit (8) from the dividend and append it to 72, then repeat: 728 / 639

Step 3:
728 divided by 639 is 1 with a remainder of 89.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 639 from 728 and we're left with 89.
Take the next digit (0) from the dividend and append it to 89, then repeat: 890 / 639

Moving on to step 4:
When dividing 890 by 639, we get 1 with a remainder of 251.
Record the quotient 1 as the next digit in the result. 
Result so far: 11.0
The remainder is 251 after subtracting 639 from 890.
Append the next digit (4) from the dividend to 251 and continue with: 2514 / 639

Moving on to step 5:
The number 639 fits into 2514 3 times, leaving a remainder of 597.
The number 3 becomes the next digit in our result. 
Result so far: 113.0
The remainder is 597 after subtracting 1917 from 2514.
Bring next digit (6) of the dividend behind the 597 and repeat the process: 5976 / 639

Advancing to step 6:
The number 639 fits into 5976 9 times, leaving a remainder of 225.
Write down 9 as next digit of the result. 
Result so far: 1139.0
If we take 5751 away from 5976, we end up with 225.
Fetch the next digit (1) from the dividend, attach it to 225 and continue: 2251 / 639

Step 7:
If we divide 2251 by 639, we get 3 and a remainder of 334.
The next digit of our result is 3. 
Result so far: 11393.0
The remainder is 334 after subtracting 1917 from 2251.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3340, and continue the process.

Going ahead to step 8:
If we divide 3340 by 639, we get 5 and a remainder of 145.
The next digit of our result is 5. 
Result so far: 11393.5
Subtracting 3195 from 3340 leaves us with 145.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1450, and continue the process.

Let's proceed to step 9:
639 goes into 1450 2 times with a remainder of 172.
Use 2 as the next digit of our solution. 
Result so far: 11393.52
If we subtract 1278 from 1450, we get 172.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1720, and continue the process.

Going ahead to step 10:
If we divide 1720 by 639, we get 2 and a remainder of 442.
The number 2 becomes the next digit in our result. 
Result so far: 11393.522
Subtracting 1278 from 1720 leaves us with 442.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4420, and continue the process.

The final outcome is 11393.522, with a leftover of 0.0442.