Finding the Third Proportional to 12,187.97 and 21,915.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,187.97 : 21,915.56 = 21,915.56 : x
2. Step 2: Convert to fraction form
   12,187.97/21,915.56 = 21,915.56/x
3. Step 3: Cross multiply
   12,187.97x = 21,915.56 × 21,915.56
4. Step 4: Simplify right side
   12,187.97x = 480,291,879.69
5. Step 5: Solve for x
   x = 480,291,879.69/12,187.97
6. Step 6: Final answer
   x = 39,407.05