Finding the Third Proportional to 297,245 and 646,978

Step by Step Solution

1. Step 1: Write the proportion equation
   297,245 : 646,978 = 646,978 : x
2. Step 2: Convert to fraction form
   297,245/646,978 = 646,978/x
3. Step 3: Cross multiply
   297,245x = 646,978 × 646,978
4. Step 4: Simplify right side
   297,245x = 418,580,532,484
5. Step 5: Solve for x
   x = 418,580,532,484/297,245
6. Step 6: Final answer
   x = 1,408,200.42