Finding the Third Proportional to 12,987 and 31,401

Step by Step Solution

1. Step 1: Write the proportion equation
   12,987 : 31,401 = 31,401 : x
2. Step 2: Convert to fraction form
   12,987/31,401 = 31,401/x
3. Step 3: Cross multiply
   12,987x = 31,401 × 31,401
4. Step 4: Simplify right side
   12,987x = 986,022,801
5. Step 5: Solve for x
   x = 986,022,801/12,987
6. Step 6: Final answer
   x = 75,923.83