Step 1:
The first step to converting 15870378.418432 to a fraction is to re-write 15870378.418432 in the form p/q where p and q are both positive integers. To start with, 15870378.418432 can be written as simply 15870378.418432/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 15870378.418432, which in this case is 6. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 15870378.418432/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 15870378.418432/1 each by 1000000:
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 15870378.418432 as a fraction:
15870378/1 / 1