Finding the Third Proportional to 11,989.50 and 18,151.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11,989.50 : 18,151.50 = 18,151.50 : x
2. Step 2: Convert to fraction form
   11,989.50/18,151.50 = 18,151.50/x
3. Step 3: Cross multiply
   11,989.50x = 18,151.50 × 18,151.50
4. Step 4: Simplify right side
   11,989.50x = 329,476,952.25
5. Step 5: Solve for x
   x = 329,476,952.25/11,989.50
6. Step 6: Final answer
   x = 27,480.46