Finding the Third Proportional to 408,702 and 613,189.50

Step by Step Solution

1. Step 1: Write the proportion equation
   408,702 : 613,189.50 = 613,189.50 : x
2. Step 2: Convert to fraction form
   408,702/613,189.50 = 613,189.50/x
3. Step 3: Cross multiply
   408,702x = 613,189.50 × 613,189.50
4. Step 4: Simplify right side
   408,702x = 376,001,362,910.25
5. Step 5: Solve for x
   x = 376,001,362,910.25/408,702
6. Step 6: Final answer
   x = 919,989.05