Finding the Fourth Proportional to 404.42, 557.98 and 229.72

Step by Step Solution

1. Step 1: Write the proportion equation
   404.42 : 557.98 = 229.72 : x
2. Step 2: Convert to fraction form
   404.42/557.98 = 229.72/x
3. Step 3: Cross multiply
   404.42x = 557.98 × 229.72
4. Step 4: Simplify right side
   404.42x = 128,179.17
5. Step 5: Solve for x
   x = 128,179.17/404.42
6. Step 6: Final answer
   x = 316.95