Finding the Third Proportional to 647,138 and 1,418,692

Step by Step Solution

1. Step 1: Write the proportion equation
   647,138 : 1,418,692 = 1,418,692 : x
2. Step 2: Convert to fraction form
   647,138/1,418,692 = 1,418,692/x
3. Step 3: Cross multiply
   647,138x = 1,418,692 × 1,418,692
4. Step 4: Simplify right side
   647,138x = 2,012,686,990,864
5. Step 5: Solve for x
   x = 2,012,686,990,864/647,138
6. Step 6: Final answer
   x = 3,110,135.69