Finding the Fourth Proportional to 1,098.72, 1,647.60 and 358.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,098.72 : 1,647.60 = 358.12 : x
2. Step 2: Convert to fraction form
   1,098.72/1,647.60 = 358.12/x
3. Step 3: Cross multiply
   1,098.72x = 1,647.60 × 358.12
4. Step 4: Simplify right side
   1,098.72x = 590,038.51
5. Step 5: Solve for x
   x = 590,038.51/1,098.72
6. Step 6: Final answer
   x = 537.02