Finding the Third Proportional to 638,880 and 1,366,404

Step by Step Solution

1. Step 1: Write the proportion equation
   638,880 : 1,366,404 = 1,366,404 : x
2. Step 2: Convert to fraction form
   638,880/1,366,404 = 1,366,404/x
3. Step 3: Cross multiply
   638,880x = 1,366,404 × 1,366,404
4. Step 4: Simplify right side
   638,880x = 1,867,059,891,216
5. Step 5: Solve for x
   x = 1,867,059,891,216/638,880
6. Step 6: Final answer
   x = 2,922,395.27