Finding the Third Proportional to 309,995 and 438,763.50

Step by Step Solution

1. Step 1: Write the proportion equation
   309,995 : 438,763.50 = 438,763.50 : x
2. Step 2: Convert to fraction form
   309,995/438,763.50 = 438,763.50/x
3. Step 3: Cross multiply
   309,995x = 438,763.50 × 438,763.50
4. Step 4: Simplify right side
   309,995x = 192,513,408,932.25
5. Step 5: Solve for x
   x = 192,513,408,932.25/309,995
6. Step 6: Final answer
   x = 621,021.01