Finding the Third Proportional to 239,648 and 521,456

Step by Step Solution

1. Step 1: Write the proportion equation
   239,648 : 521,456 = 521,456 : x
2. Step 2: Convert to fraction form
   239,648/521,456 = 521,456/x
3. Step 3: Cross multiply
   239,648x = 521,456 × 521,456
4. Step 4: Simplify right side
   239,648x = 271,916,359,936
5. Step 5: Solve for x
   x = 271,916,359,936/239,648
6. Step 6: Final answer
   x = 1,134,648.98