Finding the Fourth Proportional to 10,980.80, 16,459.12 and 5,425.92

Step by Step Solution

1. Step 1: Write the proportion equation
   10,980.80 : 16,459.12 = 5,425.92 : x
2. Step 2: Convert to fraction form
   10,980.80/16,459.12 = 5,425.92/x
3. Step 3: Cross multiply
   10,980.80x = 16,459.12 × 5,425.92
4. Step 4: Simplify right side
   10,980.80x = 89,305,868.39
5. Step 5: Solve for x
   x = 89,305,868.39/10,980.80
6. Step 6: Final answer
   x = 8,132.91