Finding the Fourth Proportional to 1,105.11, 1,658.00 and 618.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.11 : 1,658.00 = 618.50 : x
2. Step 2: Convert to fraction form
   1,105.11/1,658.00 = 618.50/x
3. Step 3: Cross multiply
   1,105.11x = 1,658.00 × 618.50
4. Step 4: Simplify right side
   1,105.11x = 1,025,478.69
5. Step 5: Solve for x
   x = 1,025,478.69/1,105.11
6. Step 6: Final answer
   x = 927.94