Finding the Third Proportional to 248,742 and 394,465.50

Step by Step Solution

1. Step 1: Write the proportion equation
   248,742 : 394,465.50 = 394,465.50 : x
2. Step 2: Convert to fraction form
   248,742/394,465.50 = 394,465.50/x
3. Step 3: Cross multiply
   248,742x = 394,465.50 × 394,465.50
4. Step 4: Simplify right side
   248,742x = 155,603,030,690.25
5. Step 5: Solve for x
   x = 155,603,030,690.25/248,742
6. Step 6: Final answer
   x = 625,559.94