Finding the Third Proportional to 815,678 and 1,778,812

Step by Step Solution

1. Step 1: Write the proportion equation
   815,678 : 1,778,812 = 1,778,812 : x
2. Step 2: Convert to fraction form
   815,678/1,778,812 = 1,778,812/x
3. Step 3: Cross multiply
   815,678x = 1,778,812 × 1,778,812
4. Step 4: Simplify right side
   815,678x = 3,164,172,131,344
5. Step 5: Solve for x
   x = 3,164,172,131,344/815,678
6. Step 6: Final answer
   x = 3,879,192.69