Finding the Fourth Proportional to 10,425.28, 14,386.89 and 5,709.85

Step by Step Solution

1. Step 1: Write the proportion equation
   10,425.28 : 14,386.89 = 5,709.85 : x
2. Step 2: Convert to fraction form
   10,425.28/14,386.89 = 5,709.85/x
3. Step 3: Cross multiply
   10,425.28x = 14,386.89 × 5,709.85
4. Step 4: Simplify right side
   10,425.28x = 82,146,983.87
5. Step 5: Solve for x
   x = 82,146,983.87/10,425.28
6. Step 6: Final answer
   x = 7,879.59