Finding the Third Proportional to 636,408 and 1,372,428

Step by Step Solution

1. Step 1: Write the proportion equation
   636,408 : 1,372,428 = 1,372,428 : x
2. Step 2: Convert to fraction form
   636,408/1,372,428 = 1,372,428/x
3. Step 3: Cross multiply
   636,408x = 1,372,428 × 1,372,428
4. Step 4: Simplify right side
   636,408x = 1,883,558,615,184
5. Step 5: Solve for x
   x = 1,883,558,615,184/636,408
6. Step 6: Final answer
   x = 2,959,671.49