Finding the Third Proportional to 393,608 and 862,870

Step by Step Solution

1. Step 1: Write the proportion equation
   393,608 : 862,870 = 862,870 : x
2. Step 2: Convert to fraction form
   393,608/862,870 = 862,870/x
3. Step 3: Cross multiply
   393,608x = 862,870 × 862,870
4. Step 4: Simplify right side
   393,608x = 744,544,636,900
5. Step 5: Solve for x
   x = 744,544,636,900/393,608
6. Step 6: Final answer
   x = 1,891,589.19