Finding the Third Proportional to 297,753.75 and 647,991

Step by Step Solution

1. Step 1: Write the proportion equation
   297,753.75 : 647,991 = 647,991 : x
2. Step 2: Convert to fraction form
   297,753.75/647,991 = 647,991/x
3. Step 3: Cross multiply
   297,753.75x = 647,991 × 647,991
4. Step 4: Simplify right side
   297,753.75x = 419,892,336,081
5. Step 5: Solve for x
   x = 419,892,336,081/297,753.75
6. Step 6: Final answer
   x = 1,410,199.99