Finding the Fourth Proportional to 1,098.29, 1,648.15 and 611.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,098.29 : 1,648.15 = 611.69 : x
2. Step 2: Convert to fraction form
   1,098.29/1,648.15 = 611.69/x
3. Step 3: Cross multiply
   1,098.29x = 1,648.15 × 611.69
4. Step 4: Simplify right side
   1,098.29x = 1,008,147.10
5. Step 5: Solve for x
   x = 1,008,147.10/1,098.29
6. Step 6: Final answer
   x = 917.92