Finding the Third Proportional to 9,123 and 11,980

Step by Step Solution

1. Step 1: Write the proportion equation
   9,123 : 11,980 = 11,980 : x
2. Step 2: Convert to fraction form
   9,123/11,980 = 11,980/x
3. Step 3: Cross multiply
   9,123x = 11,980 × 11,980
4. Step 4: Simplify right side
   9,123x = 143,520,400
5. Step 5: Solve for x
   x = 143,520,400/9,123
6. Step 6: Final answer
   x = 15,731.71