Finding the Fourth Proportional to 498.69, 688.14 and 277.61

Step by Step Solution

1. Step 1: Write the proportion equation
   498.69 : 688.14 = 277.61 : x
2. Step 2: Convert to fraction form
   498.69/688.14 = 277.61/x
3. Step 3: Cross multiply
   498.69x = 688.14 × 277.61
4. Step 4: Simplify right side
   498.69x = 191,034.55
5. Step 5: Solve for x
   x = 191,034.55/498.69
6. Step 6: Final answer
   x = 383.07