Finding the Third Proportional to 415,209.50 and 677,992

Step by Step Solution

1. Step 1: Write the proportion equation
   415,209.50 : 677,992 = 677,992 : x
2. Step 2: Convert to fraction form
   415,209.50/677,992 = 677,992/x
3. Step 3: Cross multiply
   415,209.50x = 677,992 × 677,992
4. Step 4: Simplify right side
   415,209.50x = 459,673,152,064
5. Step 5: Solve for x
   x = 459,673,152,064/415,209.50
6. Step 6: Final answer
   x = 1,107,087.27