Step 1:
The first step to converting 84257.128328078 to a fraction is to re-write 84257.128328078 in the form p/q where p and q are both positive integers. To start with, 84257.128328078 can be written as simply 84257.128328078/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 84257.128328078, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 84257.128328078/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 84257.128328078/1 each by 1000000000:
Step 3:
Now the last step is to simplify the fraction (if possible) by finding similar factors and cancelling them out, which leads to the following answer for 84257.128328078 as a fraction:
589800/7 / 1