Finding the Third Proportional to 249,864 and 397,396.50

Step by Step Solution

1. Step 1: Write the proportion equation
   249,864 : 397,396.50 = 397,396.50 : x
2. Step 2: Convert to fraction form
   249,864/397,396.50 = 397,396.50/x
3. Step 3: Cross multiply
   249,864x = 397,396.50 × 397,396.50
4. Step 4: Simplify right side
   249,864x = 157,923,978,212.25
5. Step 5: Solve for x
   x = 157,923,978,212.25/249,864
6. Step 6: Final answer
   x = 632,039.74