Finding the Third Proportional to 394,128 and 861,870

Step by Step Solution

1. Step 1: Write the proportion equation
   394,128 : 861,870 = 861,870 : x
2. Step 2: Convert to fraction form
   394,128/861,870 = 861,870/x
3. Step 3: Cross multiply
   394,128x = 861,870 × 861,870
4. Step 4: Simplify right side
   394,128x = 742,819,896,900
5. Step 5: Solve for x
   x = 742,819,896,900/394,128
6. Step 6: Final answer
   x = 1,884,717.39