Finding the Third Proportional to 366,878 and 489,216.50

Step by Step Solution

1. Step 1: Write the proportion equation
   366,878 : 489,216.50 = 489,216.50 : x
2. Step 2: Convert to fraction form
   366,878/489,216.50 = 489,216.50/x
3. Step 3: Cross multiply
   366,878x = 489,216.50 × 489,216.50
4. Step 4: Simplify right side
   366,878x = 239,332,783,872.25
5. Step 5: Solve for x
   x = 239,332,783,872.25/366,878
6. Step 6: Final answer
   x = 652,349.78