Finding the Fourth Proportional to 10,431.71, 14,395.68 and 5,715.89

Step by Step Solution

1. Step 1: Write the proportion equation
   10,431.71 : 14,395.68 = 5,715.89 : x
2. Step 2: Convert to fraction form
   10,431.71/14,395.68 = 5,715.89/x
3. Step 3: Cross multiply
   10,431.71x = 14,395.68 × 5,715.89
4. Step 4: Simplify right side
   10,431.71x = 82,284,051.38
5. Step 5: Solve for x
   x = 82,284,051.38/10,431.71
6. Step 6: Final answer
   x = 7,887.88