Finding the Third Proportional to 864,540 and 1,389,069

Step by Step Solution

1. Step 1: Write the proportion equation
   864,540 : 1,389,069 = 1,389,069 : x
2. Step 2: Convert to fraction form
   864,540/1,389,069 = 1,389,069/x
3. Step 3: Cross multiply
   864,540x = 1,389,069 × 1,389,069
4. Step 4: Simplify right side
   864,540x = 1,929,512,686,761
5. Step 5: Solve for x
   x = 1,929,512,686,761/864,540
6. Step 6: Final answer
   x = 2,231,837.38