Finding the Fourth Proportional to 498.55, 687.98 and 277.51

Step by Step Solution

1. Step 1: Write the proportion equation
   498.55 : 687.98 = 277.51 : x
2. Step 2: Convert to fraction form
   498.55/687.98 = 277.51/x
3. Step 3: Cross multiply
   498.55x = 687.98 × 277.51
4. Step 4: Simplify right side
   498.55x = 190,917.89
5. Step 5: Solve for x
   x = 190,917.89/498.55
6. Step 6: Final answer
   x = 382.95