Finding the Third Proportional to 408,132 and 643,495.50

Step by Step Solution

1. Step 1: Write the proportion equation
   408,132 : 643,495.50 = 643,495.50 : x
2. Step 2: Convert to fraction form
   408,132/643,495.50 = 643,495.50/x
3. Step 3: Cross multiply
   408,132x = 643,495.50 × 643,495.50
4. Step 4: Simplify right side
   408,132x = 414,086,458,520.25
5. Step 5: Solve for x
   x = 414,086,458,520.25/408,132
6. Step 6: Final answer
   x = 1,014,589.54