Finding the Fourth Proportional to 978.89, 1,468.56 and 329.61

Step by Step Solution

1. Step 1: Write the proportion equation
   978.89 : 1,468.56 = 329.61 : x
2. Step 2: Convert to fraction form
   978.89/1,468.56 = 329.61/x
3. Step 3: Cross multiply
   978.89x = 1,468.56 × 329.61
4. Step 4: Simplify right side
   978.89x = 484,052.06
5. Step 5: Solve for x
   x = 484,052.06/978.89
6. Step 6: Final answer
   x = 494.49