Finding the Third Proportional to 638,732 and 1,390,866

Step by Step Solution

1. Step 1: Write the proportion equation
   638,732 : 1,390,866 = 1,390,866 : x
2. Step 2: Convert to fraction form
   638,732/1,390,866 = 1,390,866/x
3. Step 3: Cross multiply
   638,732x = 1,390,866 × 1,390,866
4. Step 4: Simplify right side
   638,732x = 1,934,508,229,956
5. Step 5: Solve for x
   x = 1,934,508,229,956/638,732
6. Step 6: Final answer
   x = 3,028,669.66