Finding the Fourth Proportional to 10,978.02, 16,481.25 and 9,428.04

Step by Step Solution

1. Step 1: Write the proportion equation
   10,978.02 : 16,481.25 = 9,428.04 : x
2. Step 2: Convert to fraction form
   10,978.02/16,481.25 = 9,428.04/x
3. Step 3: Cross multiply
   10,978.02x = 16,481.25 × 9,428.04
4. Step 4: Simplify right side
   10,978.02x = 155,385,884.25
5. Step 5: Solve for x
   x = 155,385,884.25/10,978.02
6. Step 6: Final answer
   x = 14,154.27