Finding the Fourth Proportional to 10,431.42, 14,394.82 and 5,715.60

Step by Step Solution

1. Step 1: Write the proportion equation
   10,431.42 : 14,394.82 = 5,715.60 : x
2. Step 2: Convert to fraction form
   10,431.42/14,394.82 = 5,715.60/x
3. Step 3: Cross multiply
   10,431.42x = 14,394.82 × 5,715.60
4. Step 4: Simplify right side
   10,431.42x = 82,275,033.19
5. Step 5: Solve for x
   x = 82,275,033.19/10,431.42
6. Step 6: Final answer
   x = 7,887.23