Finding the Third Proportional to 638,290 and 1,382,960

Step by Step Solution

1. Step 1: Write the proportion equation
   638,290 : 1,382,960 = 1,382,960 : x
2. Step 2: Convert to fraction form
   638,290/1,382,960 = 1,382,960/x
3. Step 3: Cross multiply
   638,290x = 1,382,960 × 1,382,960
4. Step 4: Simplify right side
   638,290x = 1,912,578,361,600
5. Step 5: Solve for x
   x = 1,912,578,361,600/638,290
6. Step 6: Final answer
   x = 2,996,409.72