Finding the Third Proportional to 639,345 and 1,065,424.50

Step by Step Solution

1. Step 1: Write the proportion equation
   639,345 : 1,065,424.50 = 1,065,424.50 : x
2. Step 2: Convert to fraction form
   639,345/1,065,424.50 = 1,065,424.50/x
3. Step 3: Cross multiply
   639,345x = 1,065,424.50 × 1,065,424.50
4. Step 4: Simplify right side
   639,345x = 1,135,129,365,200.25
5. Step 5: Solve for x
   x = 1,135,129,365,200.25/639,345
6. Step 6: Final answer
   x = 1,775,456.70