Finding the Fourth Proportional to 1,098.29, 1,646.87 and 404.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,098.29 : 1,646.87 = 404.72 : x
2. Step 2: Convert to fraction form
   1,098.29/1,646.87 = 404.72/x
3. Step 3: Cross multiply
   1,098.29x = 1,646.87 × 404.72
4. Step 4: Simplify right side
   1,098.29x = 666,521.23
5. Step 5: Solve for x
   x = 666,521.23/1,098.29
6. Step 6: Final answer
   x = 606.87