Finding the Fourth Proportional to 13,127.40, 18,111.60 and 9,351.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,127.40 : 18,111.60 = 9,351.18 : x
2. Step 2: Convert to fraction form
   13,127.40/18,111.60 = 9,351.18/x
3. Step 3: Cross multiply
   13,127.40x = 18,111.60 × 9,351.18
4. Step 4: Simplify right side
   13,127.40x = 169,364,831.69
5. Step 5: Solve for x
   x = 169,364,831.69/13,127.40
6. Step 6: Final answer
   x = 12,901.63