Finding the Fourth Proportional to 498,774, 688,311.78 and 272,419.50

Step by Step Solution

1. Step 1: Write the proportion equation
   498,774 : 688,311.78 = 272,419.50 : x
2. Step 2: Convert to fraction form
   498,774/688,311.78 = 272,419.50/x
3. Step 3: Cross multiply
   498,774x = 688,311.78 × 272,419.50
4. Step 4: Simplify right side
   498,774x = 187,509,550,951.71
5. Step 5: Solve for x
   x = 187,509,550,951.71/498,774
6. Step 6: Final answer
   x = 375,940.91