Finding the Third Proportional to 425,682 and 638,590.50

Step by Step Solution

1. Step 1: Write the proportion equation
   425,682 : 638,590.50 = 638,590.50 : x
2. Step 2: Convert to fraction form
   425,682/638,590.50 = 638,590.50/x
3. Step 3: Cross multiply
   425,682x = 638,590.50 × 638,590.50
4. Step 4: Simplify right side
   425,682x = 407,797,826,690.25
5. Step 5: Solve for x
   x = 407,797,826,690.25/425,682
6. Step 6: Final answer
   x = 957,987.01