Finding the Fourth Proportional to 1,109.89, 1,665.17 and 329.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.89 : 1,665.17 = 329.92 : x
2. Step 2: Convert to fraction form
   1,109.89/1,665.17 = 329.92/x
3. Step 3: Cross multiply
   1,109.89x = 1,665.17 × 329.92
4. Step 4: Simplify right side
   1,109.89x = 549,379.53
5. Step 5: Solve for x
   x = 549,379.53/1,109.89
6. Step 6: Final answer
   x = 494.98