Finding the Fourth Proportional to 404.31, 557.99 and 229.69

Step by Step Solution

1. Step 1: Write the proportion equation
   404.31 : 557.99 = 229.69 : x
2. Step 2: Convert to fraction form
   404.31/557.99 = 229.69/x
3. Step 3: Cross multiply
   404.31x = 557.99 × 229.69
4. Step 4: Simplify right side
   404.31x = 128,164.72
5. Step 5: Solve for x
   x = 128,164.72/404.31
6. Step 6: Final answer
   x = 317.00