Finding the Fourth Proportional to 10,431.30, 14,395.20 and 5,715.58

Step by Step Solution

1. Step 1: Write the proportion equation
   10,431.30 : 14,395.20 = 5,715.58 : x
2. Step 2: Convert to fraction form
   10,431.30/14,395.20 = 5,715.58/x
3. Step 3: Cross multiply
   10,431.30x = 14,395.20 × 5,715.58
4. Step 4: Simplify right side
   10,431.30x = 82,276,917.22
5. Step 5: Solve for x
   x = 82,276,917.22/10,431.30
6. Step 6: Final answer
   x = 7,887.50