Finding the Third Proportional to 138,600 and 300,510

Step by Step Solution

1. Step 1: Write the proportion equation
   138,600 : 300,510 = 300,510 : x
2. Step 2: Convert to fraction form
   138,600/300,510 = 300,510/x
3. Step 3: Cross multiply
   138,600x = 300,510 × 300,510
4. Step 4: Simplify right side
   138,600x = 90,306,260,100
5. Step 5: Solve for x
   x = 90,306,260,100/138,600
6. Step 6: Final answer
   x = 651,560.32