Finding the Fourth Proportional to 8,939.40, 12,292.62 and 7,758.42

Step by Step Solution

1. Step 1: Write the proportion equation
   8,939.40 : 12,292.62 = 7,758.42 : x
2. Step 2: Convert to fraction form
   8,939.40/12,292.62 = 7,758.42/x
3. Step 3: Cross multiply
   8,939.40x = 12,292.62 × 7,758.42
4. Step 4: Simplify right side
   8,939.40x = 95,371,308.86
5. Step 5: Solve for x
   x = 95,371,308.86/8,939.40
6. Step 6: Final answer
   x = 10,668.65