Finding the Third Proportional to 297,878 and 648,172

Step by Step Solution

1. Step 1: Write the proportion equation
   297,878 : 648,172 = 648,172 : x
2. Step 2: Convert to fraction form
   297,878/648,172 = 648,172/x
3. Step 3: Cross multiply
   297,878x = 648,172 × 648,172
4. Step 4: Simplify right side
   297,878x = 420,126,941,584
5. Step 5: Solve for x
   x = 420,126,941,584/297,878
6. Step 6: Final answer
   x = 1,410,399.36