Finding the Third Proportional to 269,717 and 388,510

Step by Step Solution

1. Step 1: Write the proportion equation
   269,717 : 388,510 = 388,510 : x
2. Step 2: Convert to fraction form
   269,717/388,510 = 388,510/x
3. Step 3: Cross multiply
   269,717x = 388,510 × 388,510
4. Step 4: Simplify right side
   269,717x = 150,940,020,100
5. Step 5: Solve for x
   x = 150,940,020,100/269,717
6. Step 6: Final answer
   x = 559,623.68