Finding the Third Proportional to 315,469 and 688,029.50

Step by Step Solution

1. Step 1: Write the proportion equation
   315,469 : 688,029.50 = 688,029.50 : x
2. Step 2: Convert to fraction form
   315,469/688,029.50 = 688,029.50/x
3. Step 3: Cross multiply
   315,469x = 688,029.50 × 688,029.50
4. Step 4: Simplify right side
   315,469x = 473,384,592,870.25
5. Step 5: Solve for x
   x = 473,384,592,870.25/315,469
6. Step 6: Final answer
   x = 1,500,574.04