Finding the Third Proportional to 12,986 and 19,858

Step by Step Solution

1. Step 1: Write the proportion equation
   12,986 : 19,858 = 19,858 : x
2. Step 2: Convert to fraction form
   12,986/19,858 = 19,858/x
3. Step 3: Cross multiply
   12,986x = 19,858 × 19,858
4. Step 4: Simplify right side
   12,986x = 394,340,164
5. Step 5: Solve for x
   x = 394,340,164/12,986
6. Step 6: Final answer
   x = 30,366.56