Finding the Third Proportional to 9,405 and 10,989

Step by Step Solution

1. Step 1: Write the proportion equation
   9,405 : 10,989 = 10,989 : x
2. Step 2: Convert to fraction form
   9,405/10,989 = 10,989/x
3. Step 3: Cross multiply
   9,405x = 10,989 × 10,989
4. Step 4: Simplify right side
   9,405x = 120,758,121
5. Step 5: Solve for x
   x = 120,758,121/9,405
6. Step 6: Final answer
   x = 12,839.78