Finding the Third Proportional to 638,388 and 1,350,540

Step by Step Solution

1. Step 1: Write the proportion equation
   638,388 : 1,350,540 = 1,350,540 : x
2. Step 2: Convert to fraction form
   638,388/1,350,540 = 1,350,540/x
3. Step 3: Cross multiply
   638,388x = 1,350,540 × 1,350,540
4. Step 4: Simplify right side
   638,388x = 1,823,958,291,600
5. Step 5: Solve for x
   x = 1,823,958,291,600/638,388
6. Step 6: Final answer
   x = 2,857,131.23