Finding the Third Proportional to 442,855 and 687,610.50

Step by Step Solution

1. Step 1: Write the proportion equation
   442,855 : 687,610.50 = 687,610.50 : x
2. Step 2: Convert to fraction form
   442,855/687,610.50 = 687,610.50/x
3. Step 3: Cross multiply
   442,855x = 687,610.50 × 687,610.50
4. Step 4: Simplify right side
   442,855x = 472,808,199,710.25
5. Step 5: Solve for x
   x = 472,808,199,710.25/442,855
6. Step 6: Final answer
   x = 1,067,636.58