Finding the Third Proportional to 425,809 and 667,657.50

Step by Step Solution

1. Step 1: Write the proportion equation
   425,809 : 667,657.50 = 667,657.50 : x
2. Step 2: Convert to fraction form
   425,809/667,657.50 = 667,657.50/x
3. Step 3: Cross multiply
   425,809x = 667,657.50 × 667,657.50
4. Step 4: Simplify right side
   425,809x = 445,766,537,306.25
5. Step 5: Solve for x
   x = 445,766,537,306.25/425,809
6. Step 6: Final answer
   x = 1,046,869.69