Step 1:
The first step to converting 8128.9120171984 to a fraction is to re-write 8128.9120171984 in the form p/q where p and q are both positive integers. To start with, 8128.9120171984 can be written as simply 8128.9120171984/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 8128.9120171984, which in this case is 10. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 8128.9120171984/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 8128.9120171984/1 each by 10000000000:
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 8128.9120171984 as a fraction:
89418/11 / 1