Finding the Third Proportional to 12,555 and 17,215.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,555 : 17,215.31 = 17,215.31 : x
2. Step 2: Convert to fraction form
   12,555/17,215.31 = 17,215.31/x
3. Step 3: Cross multiply
   12,555x = 17,215.31 × 17,215.31
4. Step 4: Simplify right side
   12,555x = 296,366,984.47
5. Step 5: Solve for x
   x = 296,366,984.47/12,555
6. Step 6: Final answer
   x = 23,605.49