Finding the Third Proportional to 138,456 and 300,240

Step by Step Solution

1. Step 1: Write the proportion equation
   138,456 : 300,240 = 300,240 : x
2. Step 2: Convert to fraction form
   138,456/300,240 = 300,240/x
3. Step 3: Cross multiply
   138,456x = 300,240 × 300,240
4. Step 4: Simplify right side
   138,456x = 90,144,057,600
5. Step 5: Solve for x
   x = 90,144,057,600/138,456
6. Step 6: Final answer
   x = 651,066.46