Finding the Fourth Proportional to 1,105.57, 1,658.63 and 618.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.57 : 1,658.63 = 618.94 : x
2. Step 2: Convert to fraction form
   1,105.57/1,658.63 = 618.94/x
3. Step 3: Cross multiply
   1,105.57x = 1,658.63 × 618.94
4. Step 4: Simplify right side
   1,105.57x = 1,026,592.45
5. Step 5: Solve for x
   x = 1,026,592.45/1,105.57
6. Step 6: Final answer
   x = 928.56