Finding the Fourth Proportional to 9,687.15, 13,367.85 and 5,708.43

Step by Step Solution

1. Step 1: Write the proportion equation
   9,687.15 : 13,367.85 = 5,708.43 : x
2. Step 2: Convert to fraction form
   9,687.15/13,367.85 = 5,708.43/x
3. Step 3: Cross multiply
   9,687.15x = 13,367.85 × 5,708.43
4. Step 4: Simplify right side
   9,687.15x = 76,309,435.98
5. Step 5: Solve for x
   x = 76,309,435.98/9,687.15
6. Step 6: Final answer
   x = 7,877.39