Step 1:
The first step to converting 115908.90991738 to a fraction is to re-write 115908.90991738 in the form p/q where p and q are both positive integers. To start with, 115908.90991738 can be written as simply 115908.90991738/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 115908.90991738, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 115908.90991738/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 115908.90991738/1 each by 100000000:
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 115908.90991738 as a fraction:
115909/1 / 1