Finding the Fourth Proportional to 16,405.71, 24,585.69 and 12,399.81

Step by Step Solution

1. Step 1: Write the proportion equation
   16,405.71 : 24,585.69 = 12,399.81 : x
2. Step 2: Convert to fraction form
   16,405.71/24,585.69 = 12,399.81/x
3. Step 3: Cross multiply
   16,405.71x = 24,585.69 × 12,399.81
4. Step 4: Simplify right side
   16,405.71x = 304,857,884.72
5. Step 5: Solve for x
   x = 304,857,884.72/16,405.71
6. Step 6: Final answer
   x = 18,582.43