Finding the Fourth Proportional to 498.59, 687.89 and 277.50

Step by Step Solution

1. Step 1: Write the proportion equation
   498.59 : 687.89 = 277.50 : x
2. Step 2: Convert to fraction form
   498.59/687.89 = 277.50/x
3. Step 3: Cross multiply
   498.59x = 687.89 × 277.50
4. Step 4: Simplify right side
   498.59x = 190,888.45
5. Step 5: Solve for x
   x = 190,888.45/498.59
6. Step 6: Final answer
   x = 382.86