Finding the Fourth Proportional to 13,385.47, 18,470.16 and 7,416.38

Step by Step Solution

1. Step 1: Write the proportion equation
   13,385.47 : 18,470.16 = 7,416.38 : x
2. Step 2: Convert to fraction form
   13,385.47/18,470.16 = 7,416.38/x
3. Step 3: Cross multiply
   13,385.47x = 18,470.16 × 7,416.38
4. Step 4: Simplify right side
   13,385.47x = 136,981,725.22
5. Step 5: Solve for x
   x = 136,981,725.22/13,385.47
6. Step 6: Final answer
   x = 10,233.61