Finding the Third Proportional to 315,468 and 688,027.50

Step by Step Solution

1. Step 1: Write the proportion equation
   315,468 : 688,027.50 = 688,027.50 : x
2. Step 2: Convert to fraction form
   315,468/688,027.50 = 688,027.50/x
3. Step 3: Cross multiply
   315,468x = 688,027.50 × 688,027.50
4. Step 4: Simplify right side
   315,468x = 473,381,840,756.25
5. Step 5: Solve for x
   x = 473,381,840,756.25/315,468
6. Step 6: Final answer
   x = 1,500,570.08