Finding the Fourth Proportional to 498.98, 688.47 and 291.98

Step by Step Solution

1. Step 1: Write the proportion equation
   498.98 : 688.47 = 291.98 : x
2. Step 2: Convert to fraction form
   498.98/688.47 = 291.98/x
3. Step 3: Cross multiply
   498.98x = 688.47 × 291.98
4. Step 4: Simplify right side
   498.98x = 201,019.47
5. Step 5: Solve for x
   x = 201,019.47/498.98
6. Step 6: Final answer
   x = 402.86