Finding the Third Proportional to 428,166 and 666,760

Step by Step Solution

1. Step 1: Write the proportion equation
   428,166 : 666,760 = 666,760 : x
2. Step 2: Convert to fraction form
   428,166/666,760 = 666,760/x
3. Step 3: Cross multiply
   428,166x = 666,760 × 666,760
4. Step 4: Simplify right side
   428,166x = 444,568,897,600
5. Step 5: Solve for x
   x = 444,568,897,600/428,166
6. Step 6: Final answer
   x = 1,038,309.67