Finding the Third Proportional to 11,689.50 and 18,108.75

Step by Step Solution

1. Step 1: Write the proportion equation
   11,689.50 : 18,108.75 = 18,108.75 : x
2. Step 2: Convert to fraction form
   11,689.50/18,108.75 = 18,108.75/x
3. Step 3: Cross multiply
   11,689.50x = 18,108.75 × 18,108.75
4. Step 4: Simplify right side
   11,689.50x = 327,926,826.56
5. Step 5: Solve for x
   x = 327,926,826.56/11,689.50
6. Step 6: Final answer
   x = 28,053.11