Finding the Third Proportional to 8,685 and 10,282.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,685 : 10,282.50 = 10,282.50 : x
2. Step 2: Convert to fraction form
   8,685/10,282.50 = 10,282.50/x
3. Step 3: Cross multiply
   8,685x = 10,282.50 × 10,282.50
4. Step 4: Simplify right side
   8,685x = 105,729,806.25
5. Step 5: Solve for x
   x = 105,729,806.25/8,685
6. Step 6: Final answer
   x = 12,173.84