Finding the Fourth Proportional to 16,978.72, 23,428.13 and 9,425.11

Step by Step Solution

1. Step 1: Write the proportion equation
   16,978.72 : 23,428.13 = 9,425.11 : x
2. Step 2: Convert to fraction form
   16,978.72/23,428.13 = 9,425.11/x
3. Step 3: Cross multiply
   16,978.72x = 23,428.13 × 9,425.11
4. Step 4: Simplify right side
   16,978.72x = 220,812,693.59
5. Step 5: Solve for x
   x = 220,812,693.59/16,978.72
6. Step 6: Final answer
   x = 13,005.26