We look at the division of 7258447 by 873 
The aim is to understand the frequency of 873 in 7258447.

Advancing to step 1:
The number 873 fits into 7 0 times, leaving a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Append the next digit (2) from the dividend to 7 and continue with: 72 / 873

Moving on to step 2:
If we divide 72 by 873, we get 0 and a remainder of 72.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 72 to get 72.
Fetch the next digit (5) from the dividend, attach it to 72 and continue: 725 / 873

Advancing to step 3:
725 divided by 873 is 0 with a remainder of 725.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 725, we get 725.
Grab the next digit (8) from the dividend, add it to 725, then carry on: 7258 / 873

Advancing to step 4:
873 can be fit into 7258 8 times, resulting in a remainder of 274.
Write down 8 as next digit of the result. 
Result so far: 8.0
Deduct 6984 from 7258 and we're left with 274.
Append the next digit (4) from the dividend to 274 and continue with: 2744 / 873

On to step 5:
2744 divided by 873 is 3 with a remainder of 125.
Put 3 as the next digit of the answer. 
Result so far: 83.0
Deduct 2619 from 2744 and we're left with 125.
Include the next digit (4) from the dividend after 125, then repeat: 1254 / 873

Moving on to step 6:
873 goes into 1254 1 times with a remainder of 381.
Record the quotient 1 as the next digit in the result. 
Result so far: 831.0
If we take 873 away from 1254, we end up with 381.
Bring next digit (7) of the dividend behind the 381 and repeat the process: 3817 / 873

Advancing to step 7:
873 can be fit into 3817 4 times, resulting in a remainder of 325.
Record the quotient 4 as the next digit in the result. 
Result so far: 8314.0
Subtract 3492 from 3817 to get 325.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3250, and continue the process.

Going ahead to step 8:
If we divide 3250 by 873, we get 3 and a remainder of 631.
Use 3 as the next digit of our solution. 
Result so far: 8314.3
If we take 2619 away from 3250, we end up with 631.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6310, and continue the process.

Going ahead to step 9:
The number 873 fits into 6310 7 times, leaving a remainder of 199.
Put 7 as the next digit of the answer. 
Result so far: 8314.37
If we take 6111 away from 6310, we end up with 199.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1990, and continue the process.

Advancing to step 10:
873 can be fit into 1990 2 times, resulting in a remainder of 244.
Use 2 as the next digit of our solution. 
Result so far: 8314.372
Subtracting 1746 from 1990 leaves us with 244.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2440, and continue the process.

On to step 11:
When dividing 2440 by 873, we get 2 with a remainder of 694.
Write down 2 as next digit of the result. 
Result so far: 8314.3722
The remainder is 694 after subtracting 1746 from 2440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6940, and continue the process.

The final outcome is 8314.3722, with a leftover of 0.00694.