Finding the Third Proportional to 315,535.50 and 489,510

Step by Step Solution

1. Step 1: Write the proportion equation
   315,535.50 : 489,510 = 489,510 : x
2. Step 2: Convert to fraction form
   315,535.50/489,510 = 489,510/x
3. Step 3: Cross multiply
   315,535.50x = 489,510 × 489,510
4. Step 4: Simplify right side
   315,535.50x = 239,620,040,100
5. Step 5: Solve for x
   x = 239,620,040,100/315,535.50
6. Step 6: Final answer
   x = 759,407.55