Finding the Third Proportional to 10,915 and 16,685.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,915 : 16,685.50 = 16,685.50 : x
2. Step 2: Convert to fraction form
   10,915/16,685.50 = 16,685.50/x
3. Step 3: Cross multiply
   10,915x = 16,685.50 × 16,685.50
4. Step 4: Simplify right side
   10,915x = 278,405,910.25
5. Step 5: Solve for x
   x = 278,405,910.25/10,915
6. Step 6: Final answer
   x = 25,506.73