Finding the Fourth Proportional to 10,431.45, 14,395.32 and 5,715.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,431.45 : 14,395.32 = 5,715.72 : x
2. Step 2: Convert to fraction form
   10,431.45/14,395.32 = 5,715.72/x
3. Step 3: Cross multiply
   10,431.45x = 14,395.32 × 5,715.72
4. Step 4: Simplify right side
   10,431.45x = 82,279,618.43
5. Step 5: Solve for x
   x = 82,279,618.43/10,431.45
6. Step 6: Final answer
   x = 7,887.65