Finding the Third Proportional to 11,215.13 and 12,855.38

Step by Step Solution

1. Step 1: Write the proportion equation
   11,215.13 : 12,855.38 = 12,855.38 : x
2. Step 2: Convert to fraction form
   11,215.13/12,855.38 = 12,855.38/x
3. Step 3: Cross multiply
   11,215.13x = 12,855.38 × 12,855.38
4. Step 4: Simplify right side
   11,215.13x = 165,260,666.39
5. Step 5: Solve for x
   x = 165,260,666.39/11,215.13
6. Step 6: Final answer
   x = 14,735.52