Finding the Third Proportional to 646,356 and 1,388,664

Step by Step Solution

1. Step 1: Write the proportion equation
   646,356 : 1,388,664 = 1,388,664 : x
2. Step 2: Convert to fraction form
   646,356/1,388,664 = 1,388,664/x
3. Step 3: Cross multiply
   646,356x = 1,388,664 × 1,388,664
4. Step 4: Simplify right side
   646,356x = 1,928,387,704,896
5. Step 5: Solve for x
   x = 1,928,387,704,896/646,356
6. Step 6: Final answer
   x = 2,983,476.14