Finding the Third Proportional to 322,520 and 687,813.50

Step by Step Solution

1. Step 1: Write the proportion equation
   322,520 : 687,813.50 = 687,813.50 : x
2. Step 2: Convert to fraction form
   322,520/687,813.50 = 687,813.50/x
3. Step 3: Cross multiply
   322,520x = 687,813.50 × 687,813.50
4. Step 4: Simplify right side
   322,520x = 473,087,410,782.25
5. Step 5: Solve for x
   x = 473,087,410,782.25/322,520
6. Step 6: Final answer
   x = 1,466,846.74