Finding the Third Proportional to 12,129.12 and 18,412.47

Step by Step Solution

1. Step 1: Write the proportion equation
   12,129.12 : 18,412.47 = 18,412.47 : x
2. Step 2: Convert to fraction form
   12,129.12/18,412.47 = 18,412.47/x
3. Step 3: Cross multiply
   12,129.12x = 18,412.47 × 18,412.47
4. Step 4: Simplify right side
   12,129.12x = 339,019,077.39
5. Step 5: Solve for x
   x = 339,019,077.39/12,129.12
6. Step 6: Final answer
   x = 27,950.85