Finding the Third Proportional to 638,753 and 1,390,906

Step by Step Solution

1. Step 1: Write the proportion equation
   638,753 : 1,390,906 = 1,390,906 : x
2. Step 2: Convert to fraction form
   638,753/1,390,906 = 1,390,906/x
3. Step 3: Cross multiply
   638,753x = 1,390,906 × 1,390,906
4. Step 4: Simplify right side
   638,753x = 1,934,619,500,836
5. Step 5: Solve for x
   x = 1,934,619,500,836/638,753
6. Step 6: Final answer
   x = 3,028,744.29