Finding the Fourth Proportional to 404.59, 606.42 and 289.31

Step by Step Solution

1. Step 1: Write the proportion equation
   404.59 : 606.42 = 289.31 : x
2. Step 2: Convert to fraction form
   404.59/606.42 = 289.31/x
3. Step 3: Cross multiply
   404.59x = 606.42 × 289.31
4. Step 4: Simplify right side
   404.59x = 175,443.37
5. Step 5: Solve for x
   x = 175,443.37/404.59
6. Step 6: Final answer
   x = 433.63