Finding the Fourth Proportional to 1,105.30, 1,658.22 and 618.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.30 : 1,658.22 = 618.69 : x
2. Step 2: Convert to fraction form
   1,105.30/1,658.22 = 618.69/x
3. Step 3: Cross multiply
   1,105.30x = 1,658.22 × 618.69
4. Step 4: Simplify right side
   1,105.30x = 1,025,924.13
5. Step 5: Solve for x
   x = 1,025,924.13/1,105.30
6. Step 6: Final answer
   x = 928.19