Finding the Fourth Proportional to 498.95, 688.56 and 277.91

Step by Step Solution

1. Step 1: Write the proportion equation
   498.95 : 688.56 = 277.91 : x
2. Step 2: Convert to fraction form
   498.95/688.56 = 277.91/x
3. Step 3: Cross multiply
   498.95x = 688.56 × 277.91
4. Step 4: Simplify right side
   498.95x = 191,357.71
5. Step 5: Solve for x
   x = 191,357.71/498.95
6. Step 6: Final answer
   x = 383.52