Finding the Fourth Proportional to 498.93, 688.18 and 291.93

Step by Step Solution

1. Step 1: Write the proportion equation
   498.93 : 688.18 = 291.93 : x
2. Step 2: Convert to fraction form
   498.93/688.18 = 291.93/x
3. Step 3: Cross multiply
   498.93x = 688.18 × 291.93
4. Step 4: Simplify right side
   498.93x = 200,900.39
5. Step 5: Solve for x
   x = 200,900.39/498.93
6. Step 6: Final answer
   x = 402.66