Finding the Fourth Proportional to 1,105.64, 1,658.46 and 618.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.64 : 1,658.46 = 618.69 : x
2. Step 2: Convert to fraction form
   1,105.64/1,658.46 = 618.69/x
3. Step 3: Cross multiply
   1,105.64x = 1,658.46 × 618.69
4. Step 4: Simplify right side
   1,105.64x = 1,026,072.62
5. Step 5: Solve for x
   x = 1,026,072.62/1,105.64
6. Step 6: Final answer
   x = 928.03