Finding the Third Proportional to 428,760 and 667,622.25

Step by Step Solution

1. Step 1: Write the proportion equation
   428,760 : 667,622.25 = 667,622.25 : x
2. Step 2: Convert to fraction form
   428,760/667,622.25 = 667,622.25/x
3. Step 3: Cross multiply
   428,760x = 667,622.25 × 667,622.25
4. Step 4: Simplify right side
   428,760x = 445,719,468,695.06
5. Step 5: Solve for x
   x = 445,719,468,695.06/428,760
6. Step 6: Final answer
   x = 1,039,554.69