Finding the Third Proportional to 638,746 and 1,390,892

Step by Step Solution

1. Step 1: Write the proportion equation
   638,746 : 1,390,892 = 1,390,892 : x
2. Step 2: Convert to fraction form
   638,746/1,390,892 = 1,390,892/x
3. Step 3: Cross multiply
   638,746x = 1,390,892 × 1,390,892
4. Step 4: Simplify right side
   638,746x = 1,934,580,555,664
5. Step 5: Solve for x
   x = 1,934,580,555,664/638,746
6. Step 6: Final answer
   x = 3,028,716.51