Finding the Fourth Proportional to 16,978.84, 23,430.85 and 9,425.17

Step by Step Solution

1. Step 1: Write the proportion equation
   16,978.84 : 23,430.85 = 9,425.17 : x
2. Step 2: Convert to fraction form
   16,978.84/23,430.85 = 9,425.17/x
3. Step 3: Cross multiply
   16,978.84x = 23,430.85 × 9,425.17
4. Step 4: Simplify right side
   16,978.84x = 220,839,744.49
5. Step 5: Solve for x
   x = 220,839,744.49/16,978.84
6. Step 6: Final answer
   x = 13,006.76