Step 1:
The first step to converting 12126.90366789 to a fraction is to re-write 12126.90366789 in the form p/q where p and q are both positive integers. To start with, 12126.90366789 can be written as simply 12126.90366789/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 12126.90366789, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 12126.90366789/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 12126.90366789/1 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 12126.90366789 as a fraction:
121269/10 / 1