Finding the Third Proportional to 371,638 and 815,456

Step by Step Solution

1. Step 1: Write the proportion equation
   371,638 : 815,456 = 815,456 : x
2. Step 2: Convert to fraction form
   371,638/815,456 = 815,456/x
3. Step 3: Cross multiply
   371,638x = 815,456 × 815,456
4. Step 4: Simplify right side
   371,638x = 664,968,487,936
5. Step 5: Solve for x
   x = 664,968,487,936/371,638
6. Step 6: Final answer
   x = 1,789,290.89