Finding the Third Proportional to 418,188 and 648,450

Step by Step Solution

1. Step 1: Write the proportion equation
   418,188 : 648,450 = 648,450 : x
2. Step 2: Convert to fraction form
   418,188/648,450 = 648,450/x
3. Step 3: Cross multiply
   418,188x = 648,450 × 648,450
4. Step 4: Simplify right side
   418,188x = 420,487,402,500
5. Step 5: Solve for x
   x = 420,487,402,500/418,188
6. Step 6: Final answer
   x = 1,005,498.49