Step 1:
The first step to converting 919.9866128721 to a fraction is to re-write 919.9866128721 in the form p/q where p and q are both positive integers. To start with, 919.9866128721 can be written as simply 919.9866128721/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 919.9866128721, which in this case is 10. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 919.9866128721/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 919.9866128721/1 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 919.9866128721 as a fraction:
68079/74 / 1