Finding the Third Proportional to 864,560 and 1,389,099

Step by Step Solution

1. Step 1: Write the proportion equation
   864,560 : 1,389,099 = 1,389,099 : x
2. Step 2: Convert to fraction form
   864,560/1,389,099 = 1,389,099/x
3. Step 3: Cross multiply
   864,560x = 1,389,099 × 1,389,099
4. Step 4: Simplify right side
   864,560x = 1,929,596,031,801
5. Step 5: Solve for x
   x = 1,929,596,031,801/864,560
6. Step 6: Final answer
   x = 2,231,882.15