Finding the Fourth Proportional to 1,105.47, 1,658.85 and 489.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.47 : 1,658.85 = 489.15 : x
2. Step 2: Convert to fraction form
   1,105.47/1,658.85 = 489.15/x
3. Step 3: Cross multiply
   1,105.47x = 1,658.85 × 489.15
4. Step 4: Simplify right side
   1,105.47x = 811,426.48
5. Step 5: Solve for x
   x = 811,426.48/1,105.47
6. Step 6: Final answer
   x = 734.01