We look at the division of 84120879 by 509 
Let's see how many times 509 fits into 84120879.

Step 1:
8 divided by 509 is 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Fetch the next digit (4) from the dividend, attach it to 8 and continue: 84 / 509

Advancing to step 2:
When dividing 84 by 509, we get 0 with a remainder of 84.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 84 and we're left with 84.
Include the next digit (1) from the dividend after 84, then repeat: 841 / 509

Advancing to step 3:
841 divided by 509 is 1 with a remainder of 332.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 509 from 841, we get 332.
Grab the next digit (2) from the dividend, add it to 332, then carry on: 3322 / 509

Moving on to step 4:
509 can be fit into 3322 6 times, resulting in a remainder of 268.
The number 6 becomes the next digit in our result. 
Result so far: 16.0
If we take 3054 away from 3322, we end up with 268.
Append the next digit (0) from the dividend to 268 and continue with: 2680 / 509

Step 5:
If we divide 2680 by 509, we get 5 and a remainder of 135.
Write down 5 as next digit of the result. 
Result so far: 165.0
Subtract 2545 from 2680 to get 135.
Fetch the next digit (8) from the dividend, attach it to 135 and continue: 1358 / 509

Advancing to step 6:
509 goes into 1358 2 times with a remainder of 340.
Use 2 as the next digit of our solution. 
Result so far: 1652.0
Deduct 1018 from 1358 and we're left with 340.
Append the next digit (7) from the dividend to 340 and continue with: 3407 / 509

On to step 7:
When dividing 3407 by 509, we get 6 with a remainder of 353.
The next digit of our result is 6. 
Result so far: 16526.0
Deduct 3054 from 3407 and we're left with 353.
Include the next digit (9) from the dividend after 353, then repeat: 3539 / 509

Step 8:
3539 divided by 509 is 6 with a remainder of 485.
The number 6 becomes the next digit in our result. 
Result so far: 165266.0
Subtracting 3054 from 3539 leaves us with 485.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4850, and continue the process.

Let's proceed to step 9:
509 can be fit into 4850 9 times, resulting in a remainder of 269.
The next digit of our result is 9. 
Result so far: 165266.9
If we subtract 4581 from 4850, we get 269.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2690, and continue the process.

Let's proceed to step 10:
If we divide 2690 by 509, we get 5 and a remainder of 145.
Put 5 as the next digit of the answer. 
Result so far: 165266.95
If we take 2545 away from 2690, we end up 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.

Moving on to step 11:
509 can be fit into 1450 2 times, resulting in a remainder of 432.
Write down 2 as next digit of the result. 
Result so far: 165266.952
The remainder is 432 after subtracting 1018 from 1450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4320, and continue the process.

Moving on to step 12:
4320 divided by 509 is 8 with a remainder of 248.
Put 8 as the next digit of the answer. 
Result so far: 165266.9528
The remainder is 248 after subtracting 4072 from 4320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2480, and continue the process.

Let's proceed to step 13:
509 can be fit into 2480 4 times, resulting in a remainder of 444.
Use 4 as the next digit of our solution. 
Result so far: 165266.95284
Subtract 2036 from 2480 to get 444.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4440, and continue the process.

On to step 14:
4440 divided by 509 is 8 with a remainder of 368.
Record the quotient 8 as the next digit in the result. 
Result so far: 165266.952848
The remainder is 368 after subtracting 4072 from 4440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3680, and continue the process.

Let's proceed to step 15:
3680 divided by 509 is 7 with a remainder of 117.
The number 7 becomes the next digit in our result. 
Result so far: 165266.9528487
Subtract 3563 from 3680 to get 117.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1170, and continue the process.

Step 16:
The number 509 fits into 1170 2 times, leaving a remainder of 152.
The next digit of our result is 2. 
Result so far: 165266.95284872
Subtracting 1018 from 1170 leaves us with 152.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1520, and continue the process.

In conclusion, the division gives 165266.95284872 with a balance of 1.52e-07.