Finding the Fourth Proportional to 10,434.20, 14,399.12 and 5,718.47

Step by Step Solution

1. Step 1: Write the proportion equation
   10,434.20 : 14,399.12 = 5,718.47 : x
2. Step 2: Convert to fraction form
   10,434.20/14,399.12 = 5,718.47/x
3. Step 3: Cross multiply
   10,434.20x = 14,399.12 × 5,718.47
4. Step 4: Simplify right side
   10,434.20x = 82,340,907.15
5. Step 5: Solve for x
   x = 82,340,907.15/10,434.20
6. Step 6: Final answer
   x = 7,891.44