Finding the Third Proportional to 398,586 and 605,260.50

Step by Step Solution

1. Step 1: Write the proportion equation
   398,586 : 605,260.50 = 605,260.50 : x
2. Step 2: Convert to fraction form
   398,586/605,260.50 = 605,260.50/x
3. Step 3: Cross multiply
   398,586x = 605,260.50 × 605,260.50
4. Step 4: Simplify right side
   398,586x = 366,340,272,860.25
5. Step 5: Solve for x
   x = 366,340,272,860.25/398,586
6. Step 6: Final answer
   x = 919,099.70