Finding the Third Proportional to 9,639 and 10,885.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,639 : 10,885.50 = 10,885.50 : x
2. Step 2: Convert to fraction form
   9,639/10,885.50 = 10,885.50/x
3. Step 3: Cross multiply
   9,639x = 10,885.50 × 10,885.50
4. Step 4: Simplify right side
   9,639x = 118,494,110.25
5. Step 5: Solve for x
   x = 118,494,110.25/9,639
6. Step 6: Final answer
   x = 12,293.20