Finding the Third Proportional to 138,648 and 300,912

Step by Step Solution

1. Step 1: Write the proportion equation
   138,648 : 300,912 = 300,912 : x
2. Step 2: Convert to fraction form
   138,648/300,912 = 300,912/x
3. Step 3: Cross multiply
   138,648x = 300,912 × 300,912
4. Step 4: Simplify right side
   138,648x = 90,548,031,744
5. Step 5: Solve for x
   x = 90,548,031,744/138,648
6. Step 6: Final answer
   x = 653,078.53