Finding the Third Proportional to 397,242 and 815,413.50

Step by Step Solution

1. Step 1: Write the proportion equation
   397,242 : 815,413.50 = 815,413.50 : x
2. Step 2: Convert to fraction form
   397,242/815,413.50 = 815,413.50/x
3. Step 3: Cross multiply
   397,242x = 815,413.50 × 815,413.50
4. Step 4: Simplify right side
   397,242x = 664,899,175,982.25
5. Step 5: Solve for x
   x = 664,899,175,982.25/397,242
6. Step 6: Final answer
   x = 1,673,788.71