Finding the Fourth Proportional to 1,105.38, 1,658.42 and 618.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.38 : 1,658.42 = 618.09 : x
2. Step 2: Convert to fraction form
   1,105.38/1,658.42 = 618.09/x
3. Step 3: Cross multiply
   1,105.38x = 1,658.42 × 618.09
4. Step 4: Simplify right side
   1,105.38x = 1,025,049.73
5. Step 5: Solve for x
   x = 1,025,049.73/1,105.38
6. Step 6: Final answer
   x = 927.33