Finding the Third Proportional to 432,364.50 and 687,039

Step by Step Solution

1. Step 1: Write the proportion equation
   432,364.50 : 687,039 = 687,039 : x
2. Step 2: Convert to fraction form
   432,364.50/687,039 = 687,039/x
3. Step 3: Cross multiply
   432,364.50x = 687,039 × 687,039
4. Step 4: Simplify right side
   432,364.50x = 472,022,587,521
5. Step 5: Solve for x
   x = 472,022,587,521/432,364.50
6. Step 6: Final answer
   x = 1,091,723.74