Finding the Third Proportional to 12,129.19 and 18,118.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,129.19 : 18,118.88 = 18,118.88 : x
2. Step 2: Convert to fraction form
   12,129.19/18,118.88 = 18,118.88/x
3. Step 3: Cross multiply
   12,129.19x = 18,118.88 × 18,118.88
4. Step 4: Simplify right side
   12,129.19x = 328,293,631.27
5. Step 5: Solve for x
   x = 328,293,631.27/12,129.19
6. Step 6: Final answer
   x = 27,066.42