Finding the Fourth Proportional to 16,478.91, 22,740.57 and 9,405.18

Step by Step Solution

1. Step 1: Write the proportion equation
   16,478.91 : 22,740.57 = 9,405.18 : x
2. Step 2: Convert to fraction form
   16,478.91/22,740.57 = 9,405.18/x
3. Step 3: Cross multiply
   16,478.91x = 22,740.57 × 9,405.18
4. Step 4: Simplify right side
   16,478.91x = 213,879,154.15
5. Step 5: Solve for x
   x = 213,879,154.15/16,478.91
6. Step 6: Final answer
   x = 12,978.96