Finding the Fourth Proportional to 10,978.24, 16,446.72 and 5,425.12

Step by Step Solution

1. Step 1: Write the proportion equation
   10,978.24 : 16,446.72 = 5,425.12 : x
2. Step 2: Convert to fraction form
   10,978.24/16,446.72 = 5,425.12/x
3. Step 3: Cross multiply
   10,978.24x = 16,446.72 × 5,425.12
4. Step 4: Simplify right side
   10,978.24x = 89,225,429.61
5. Step 5: Solve for x
   x = 89,225,429.61/10,978.24
6. Step 6: Final answer
   x = 8,127.48