Finding the Fourth Proportional to 1,098.72, 1,648.17 and 449.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,098.72 : 1,648.17 = 449.28 : x
2. Step 2: Convert to fraction form
   1,098.72/1,648.17 = 449.28/x
3. Step 3: Cross multiply
   1,098.72x = 1,648.17 × 449.28
4. Step 4: Simplify right side
   1,098.72x = 740,489.82
5. Step 5: Solve for x
   x = 740,489.82/1,098.72
6. Step 6: Final answer
   x = 673.96