Finding the Third Proportional to 12,087.56 and 18,678.09

Step by Step Solution

1. Step 1: Write the proportion equation
   12,087.56 : 18,678.09 = 18,678.09 : x
2. Step 2: Convert to fraction form
   12,087.56/18,678.09 = 18,678.09/x
3. Step 3: Cross multiply
   12,087.56x = 18,678.09 × 18,678.09
4. Step 4: Simplify right side
   12,087.56x = 348,871,186.13
5. Step 5: Solve for x
   x = 348,871,186.13/12,087.56
6. Step 6: Final answer
   x = 28,862.00