Finding the Third Proportional to 321,939 and 498,034.50

Step by Step Solution

1. Step 1: Write the proportion equation
   321,939 : 498,034.50 = 498,034.50 : x
2. Step 2: Convert to fraction form
   321,939/498,034.50 = 498,034.50/x
3. Step 3: Cross multiply
   321,939x = 498,034.50 × 498,034.50
4. Step 4: Simplify right side
   321,939x = 248,038,363,190.25
5. Step 5: Solve for x
   x = 248,038,363,190.25/321,939
6. Step 6: Final answer
   x = 770,451.43