Finding the Third Proportional to 815,129 and 1,787,721

Step by Step Solution

1. Step 1: Write the proportion equation
   815,129 : 1,787,721 = 1,787,721 : x
2. Step 2: Convert to fraction form
   815,129/1,787,721 = 1,787,721/x
3. Step 3: Cross multiply
   815,129x = 1,787,721 × 1,787,721
4. Step 4: Simplify right side
   815,129x = 3,195,946,373,841
5. Step 5: Solve for x
   x = 3,195,946,373,841/815,129
6. Step 6: Final answer
   x = 3,920,786.00