Finding the Third Proportional to 442,885.50 and 687,089.25

Step by Step Solution

1. Step 1: Write the proportion equation
   442,885.50 : 687,089.25 = 687,089.25 : x
2. Step 2: Convert to fraction form
   442,885.50/687,089.25 = 687,089.25/x
3. Step 3: Cross multiply
   442,885.50x = 687,089.25 × 687,089.25
4. Step 4: Simplify right side
   442,885.50x = 472,091,637,465.56
5. Step 5: Solve for x
   x = 472,091,637,465.56/442,885.50
6. Step 6: Final answer
   x = 1,065,945.12