Finding the Third Proportional to 309,870.56 and 667,171.69

Step by Step Solution

1. Step 1: Write the proportion equation
   309,870.56 : 667,171.69 = 667,171.69 : x
2. Step 2: Convert to fraction form
   309,870.56/667,171.69 = 667,171.69/x
3. Step 3: Cross multiply
   309,870.56x = 667,171.69 × 667,171.69
4. Step 4: Simplify right side
   309,870.56x = 445,118,060,601.60
5. Step 5: Solve for x
   x = 445,118,060,601.60/309,870.56
6. Step 6: Final answer
   x = 1,436,464.49