Finding the Third Proportional to 295,609.50 and 638,388

Step by Step Solution

1. Step 1: Write the proportion equation
   295,609.50 : 638,388 = 638,388 : x
2. Step 2: Convert to fraction form
   295,609.50/638,388 = 638,388/x
3. Step 3: Cross multiply
   295,609.50x = 638,388 × 638,388
4. Step 4: Simplify right side
   295,609.50x = 407,539,238,544
5. Step 5: Solve for x
   x = 407,539,238,544/295,609.50
6. Step 6: Final answer
   x = 1,378,640.53