Finding the Third Proportional to 138,610 and 301,540

Step by Step Solution

1. Step 1: Write the proportion equation
   138,610 : 301,540 = 301,540 : x
2. Step 2: Convert to fraction form
   138,610/301,540 = 301,540/x
3. Step 3: Cross multiply
   138,610x = 301,540 × 301,540
4. Step 4: Simplify right side
   138,610x = 90,926,371,600
5. Step 5: Solve for x
   x = 90,926,371,600/138,610
6. Step 6: Final answer
   x = 655,987.10