Finding the Third Proportional to 284,679 and 426,870

Step by Step Solution

1. Step 1: Write the proportion equation
   284,679 : 426,870 = 426,870 : x
2. Step 2: Convert to fraction form
   284,679/426,870 = 426,870/x
3. Step 3: Cross multiply
   284,679x = 426,870 × 426,870
4. Step 4: Simplify right side
   284,679x = 182,217,996,900
5. Step 5: Solve for x
   x = 182,217,996,900/284,679
6. Step 6: Final answer
   x = 640,082.33