Finding the Fourth Proportional to 498.05, 687.39 and 298.89

Step by Step Solution

1. Step 1: Write the proportion equation
   498.05 : 687.39 = 298.89 : x
2. Step 2: Convert to fraction form
   498.05/687.39 = 298.89/x
3. Step 3: Cross multiply
   498.05x = 687.39 × 298.89
4. Step 4: Simplify right side
   498.05x = 205,452.88
5. Step 5: Solve for x
   x = 205,452.88/498.05
6. Step 6: Final answer
   x = 412.52