Finding the Third Proportional to 11,789.30 and 18,401.55

Step by Step Solution

1. Step 1: Write the proportion equation
   11,789.30 : 18,401.55 = 18,401.55 : x
2. Step 2: Convert to fraction form
   11,789.30/18,401.55 = 18,401.55/x
3. Step 3: Cross multiply
   11,789.30x = 18,401.55 × 18,401.55
4. Step 4: Simplify right side
   11,789.30x = 338,617,214.92
5. Step 5: Solve for x
   x = 338,617,214.92/11,789.30
6. Step 6: Final answer
   x = 28,722.43