Finding the Fourth Proportional to 12,969.12, 17,903.92 and 10,131.36

Step by Step Solution

1. Step 1: Write the proportion equation
   12,969.12 : 17,903.92 = 10,131.36 : x
2. Step 2: Convert to fraction form
   12,969.12/17,903.92 = 10,131.36/x
3. Step 3: Cross multiply
   12,969.12x = 17,903.92 × 10,131.36
4. Step 4: Simplify right side
   12,969.12x = 181,391,058.93
5. Step 5: Solve for x
   x = 181,391,058.93/12,969.12
6. Step 6: Final answer
   x = 13,986.38