Finding the Fourth Proportional to 13,325.38, 18,388.17 and 7,658.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,325.38 : 18,388.17 = 7,658.78 : x
2. Step 2: Convert to fraction form
   13,325.38/18,388.17 = 7,658.78/x
3. Step 3: Cross multiply
   13,325.38x = 18,388.17 × 7,658.78
4. Step 4: Simplify right side
   13,325.38x = 140,830,856.69
5. Step 5: Solve for x
   x = 140,830,856.69/13,325.38
6. Step 6: Final answer
   x = 10,568.62