Finding the Fourth Proportional to 498.50, 687.93 and 291.50

Step by Step Solution

1. Step 1: Write the proportion equation
   498.50 : 687.93 = 291.50 : x
2. Step 2: Convert to fraction form
   498.50/687.93 = 291.50/x
3. Step 3: Cross multiply
   498.50x = 687.93 × 291.50
4. Step 4: Simplify right side
   498.50x = 200,531.60
5. Step 5: Solve for x
   x = 200,531.60/498.50
6. Step 6: Final answer
   x = 402.27