Finding the Third Proportional to 289,665 and 605,820

Step by Step Solution

1. Step 1: Write the proportion equation
   289,665 : 605,820 = 605,820 : x
2. Step 2: Convert to fraction form
   289,665/605,820 = 605,820/x
3. Step 3: Cross multiply
   289,665x = 605,820 × 605,820
4. Step 4: Simplify right side
   289,665x = 367,017,872,400
5. Step 5: Solve for x
   x = 367,017,872,400/289,665
6. Step 6: Final answer
   x = 1,267,042.52