Finding the Fourth Proportional to 404.42, 558.15 and 229.82

Step by Step Solution

1. Step 1: Write the proportion equation
   404.42 : 558.15 = 229.82 : x
2. Step 2: Convert to fraction form
   404.42/558.15 = 229.82/x
3. Step 3: Cross multiply
   404.42x = 558.15 × 229.82
4. Step 4: Simplify right side
   404.42x = 128,274.03
5. Step 5: Solve for x
   x = 128,274.03/404.42
6. Step 6: Final answer
   x = 317.18