Finding the Fourth Proportional to 8,308.09, 12,465.78 and 5,715.28

Step by Step Solution

1. Step 1: Write the proportion equation
   8,308.09 : 12,465.78 = 5,715.28 : x
2. Step 2: Convert to fraction form
   8,308.09/12,465.78 = 5,715.28/x
3. Step 3: Cross multiply
   8,308.09x = 12,465.78 × 5,715.28
4. Step 4: Simplify right side
   8,308.09x = 71,245,423.12
5. Step 5: Solve for x
   x = 71,245,423.12/8,308.09
6. Step 6: Final answer
   x = 8,575.43