Finding the Third Proportional to 121,867 and 131,404

Step by Step Solution

1. Step 1: Write the proportion equation
   121,867 : 131,404 = 131,404 : x
2. Step 2: Convert to fraction form
   121,867/131,404 = 131,404/x
3. Step 3: Cross multiply
   121,867x = 131,404 × 131,404
4. Step 4: Simplify right side
   121,867x = 17,267,011,216
5. Step 5: Solve for x
   x = 17,267,011,216/121,867
6. Step 6: Final answer
   x = 141,687.34