Finding the Third Proportional to 10,908 and 11,839.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,908 : 11,839.50 = 11,839.50 : x
2. Step 2: Convert to fraction form
   10,908/11,839.50 = 11,839.50/x
3. Step 3: Cross multiply
   10,908x = 11,839.50 × 11,839.50
4. Step 4: Simplify right side
   10,908x = 140,173,760.25
5. Step 5: Solve for x
   x = 140,173,760.25/10,908
6. Step 6: Final answer
   x = 12,850.55