Finding the Third Proportional to 11,687.63 and 18,145.69

Step by Step Solution

1. Step 1: Write the proportion equation
   11,687.63 : 18,145.69 = 18,145.69 : x
2. Step 2: Convert to fraction form
   11,687.63/18,145.69 = 18,145.69/x
3. Step 3: Cross multiply
   11,687.63x = 18,145.69 × 18,145.69
4. Step 4: Simplify right side
   11,687.63x = 329,265,974.85
5. Step 5: Solve for x
   x = 329,265,974.85/11,687.63
6. Step 6: Final answer
   x = 28,172.19