Finding the Fourth Proportional to 16,978.20, 23,429.89 and 9,425.69

Step by Step Solution

1. Step 1: Write the proportion equation
   16,978.20 : 23,429.89 = 9,425.69 : x
2. Step 2: Convert to fraction form
   16,978.20/23,429.89 = 9,425.69/x
3. Step 3: Cross multiply
   16,978.20x = 23,429.89 × 9,425.69
4. Step 4: Simplify right side
   16,978.20x = 220,842,879.87
5. Step 5: Solve for x
   x = 220,842,879.87/16,978.20
6. Step 6: Final answer
   x = 13,007.44