Finding the Fourth Proportional to 16,978.87, 23,431.04 and 9,425.35

Step by Step Solution

1. Step 1: Write the proportion equation
   16,978.87 : 23,431.04 = 9,425.35 : x
2. Step 2: Convert to fraction form
   16,978.87/23,431.04 = 9,425.35/x
3. Step 3: Cross multiply
   16,978.87x = 23,431.04 × 9,425.35
4. Step 4: Simplify right side
   16,978.87x = 220,845,752.86
5. Step 5: Solve for x
   x = 220,845,752.86/16,978.87
6. Step 6: Final answer
   x = 13,007.09