Finding the Third Proportional to 8,255.25 and 12,691.69

Step by Step Solution

1. Step 1: Write the proportion equation
   8,255.25 : 12,691.69 = 12,691.69 : x
2. Step 2: Convert to fraction form
   8,255.25/12,691.69 = 12,691.69/x
3. Step 3: Cross multiply
   8,255.25x = 12,691.69 × 12,691.69
4. Step 4: Simplify right side
   8,255.25x = 161,078,931.60
5. Step 5: Solve for x
   x = 161,078,931.60/8,255.25
6. Step 6: Final answer
   x = 19,512.30