Finding the Third Proportional to 315,503 and 684,238.50

Step by Step Solution

1. Step 1: Write the proportion equation
   315,503 : 684,238.50 = 684,238.50 : x
2. Step 2: Convert to fraction form
   315,503/684,238.50 = 684,238.50/x
3. Step 3: Cross multiply
   315,503x = 684,238.50 × 684,238.50
4. Step 4: Simplify right side
   315,503x = 468,182,324,882.25
5. Step 5: Solve for x
   x = 468,182,324,882.25/315,503
6. Step 6: Final answer
   x = 1,483,923.53