Finding the Third Proportional to 638,976 and 1,363,392

Step by Step Solution

1. Step 1: Write the proportion equation
   638,976 : 1,363,392 = 1,363,392 : x
2. Step 2: Convert to fraction form
   638,976/1,363,392 = 1,363,392/x
3. Step 3: Cross multiply
   638,976x = 1,363,392 × 1,363,392
4. Step 4: Simplify right side
   638,976x = 1,858,837,745,664
5. Step 5: Solve for x
   x = 1,858,837,745,664/638,976
6. Step 6: Final answer
   x = 2,909,088.52