Finding the Fourth Proportional to 9,665.92, 13,345.39 and 7,423.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,665.92 : 13,345.39 = 7,423.78 : x
2. Step 2: Convert to fraction form
   9,665.92/13,345.39 = 7,423.78/x
3. Step 3: Cross multiply
   9,665.92x = 13,345.39 × 7,423.78
4. Step 4: Simplify right side
   9,665.92x = 99,073,202.26
5. Step 5: Solve for x
   x = 99,073,202.26/9,665.92
6. Step 6: Final answer
   x = 10,249.75