Step 1:
The first step to converting 25521.999128478 to a fraction is to re-write 25521.999128478 in the form p/q where p and q are both positive integers. To start with, 25521.999128478 can be written as simply 25521.999128478/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 25521.999128478, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 25521.999128478/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 25521.999128478/1 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 25521.999128478 as a fraction:
25522/1 / 1