Finding the Third Proportional to 864,644 and 1,381,287

Step by Step Solution

1. Step 1: Write the proportion equation
   864,644 : 1,381,287 = 1,381,287 : x
2. Step 2: Convert to fraction form
   864,644/1,381,287 = 1,381,287/x
3. Step 3: Cross multiply
   864,644x = 1,381,287 × 1,381,287
4. Step 4: Simplify right side
   864,644x = 1,907,953,776,369
5. Step 5: Solve for x
   x = 1,907,953,776,369/864,644
6. Step 6: Final answer
   x = 2,206,635.07