Finding the Fourth Proportional to 10,439.72, 14,406.80 and 5,724.12

Step by Step Solution

1. Step 1: Write the proportion equation
   10,439.72 : 14,406.80 = 5,724.12 : x
2. Step 2: Convert to fraction form
   10,439.72/14,406.80 = 5,724.12/x
3. Step 3: Cross multiply
   10,439.72x = 14,406.80 × 5,724.12
4. Step 4: Simplify right side
   10,439.72x = 82,466,252.02
5. Step 5: Solve for x
   x = 82,466,252.02/10,439.72
6. Step 6: Final answer
   x = 7,899.28