Step 1:
The first step to converting 13960.639921305 to a fraction is to re-write 13960.639921305 in the form p/q where p and q are both positive integers. To start with, 13960.639921305 can be written as simply 13960.639921305/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 13960.639921305, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 13960.639921305/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 13960.639921305/1 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 13960.639921305 as a fraction:
153567/11 / 1