Finding the Fourth Proportional to 404.78, 557.82 and 334.91

Step by Step Solution

1. Step 1: Write the proportion equation
   404.78 : 557.82 = 334.91 : x
2. Step 2: Convert to fraction form
   404.78/557.82 = 334.91/x
3. Step 3: Cross multiply
   404.78x = 557.82 × 334.91
4. Step 4: Simplify right side
   404.78x = 186,820.89
5. Step 5: Solve for x
   x = 186,820.89/404.78
6. Step 6: Final answer
   x = 461.54