Finding the Third Proportional to 1,369,404 and 2,128,680

Step by Step Solution

1. Step 1: Write the proportion equation
   1,369,404 : 2,128,680 = 2,128,680 : x
2. Step 2: Convert to fraction form
   1,369,404/2,128,680 = 2,128,680/x
3. Step 3: Cross multiply
   1,369,404x = 2,128,680 × 2,128,680
4. Step 4: Simplify right side
   1,369,404x = 4,531,278,542,400
5. Step 5: Solve for x
   x = 4,531,278,542,400/1,369,404
6. Step 6: Final answer
   x = 3,308,942.10