Step 1:
The first step to converting 489678699.9688 to a fraction is to re-write 489678699.9688 in the form p/q where p and q are both positive integers. To start with, 489678699.9688 can be written as simply 489678699.9688/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 489678699.9688, which in this case is 4. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 489678699.9688/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 489678699.9688/1 each by 10000:
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 489678699.9688 as a fraction:
489678699/1 / 1