Finding the Third Proportional to 643,422 and 1,392,756

Step by Step Solution

1. Step 1: Write the proportion equation
   643,422 : 1,392,756 = 1,392,756 : x
2. Step 2: Convert to fraction form
   643,422/1,392,756 = 1,392,756/x
3. Step 3: Cross multiply
   643,422x = 1,392,756 × 1,392,756
4. Step 4: Simplify right side
   643,422x = 1,939,769,275,536
5. Step 5: Solve for x
   x = 1,939,769,275,536/643,422
6. Step 6: Final answer
   x = 3,014,769.90