Finding the Fourth Proportional to 1,098.72, 1,648.31 and 358.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,098.72 : 1,648.31 = 358.38 : x
2. Step 2: Convert to fraction form
   1,098.72/1,648.31 = 358.38/x
3. Step 3: Cross multiply
   1,098.72x = 1,648.31 × 358.38
4. Step 4: Simplify right side
   1,098.72x = 590,721.34
5. Step 5: Solve for x
   x = 590,721.34/1,098.72
6. Step 6: Final answer
   x = 537.65