Finding the Fourth Proportional to 1,105.56, 1,658.40 and 488.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.56 : 1,658.40 = 488.98 : x
2. Step 2: Convert to fraction form
   1,105.56/1,658.40 = 488.98/x
3. Step 3: Cross multiply
   1,105.56x = 1,658.40 × 488.98
4. Step 4: Simplify right side
   1,105.56x = 810,924.43
5. Step 5: Solve for x
   x = 810,924.43/1,105.56
6. Step 6: Final answer
   x = 733.50