Finding the Fourth Proportional to 1,099.10, 1,647.20 and 658.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,099.10 : 1,647.20 = 658.94 : x
2. Step 2: Convert to fraction form
   1,099.10/1,647.20 = 658.94/x
3. Step 3: Cross multiply
   1,099.10x = 1,647.20 × 658.94
4. Step 4: Simplify right side
   1,099.10x = 1,085,399.38
5. Step 5: Solve for x
   x = 1,085,399.38/1,099.10
6. Step 6: Final answer
   x = 987.53