Finding the Third Proportional to 11,101.50 and 20,988

Step by Step Solution

1. Step 1: Write the proportion equation
   11,101.50 : 20,988 = 20,988 : x
2. Step 2: Convert to fraction form
   11,101.50/20,988 = 20,988/x
3. Step 3: Cross multiply
   11,101.50x = 20,988 × 20,988
4. Step 4: Simplify right side
   11,101.50x = 440,496,144
5. Step 5: Solve for x
   x = 440,496,144/11,101.50
6. Step 6: Final answer
   x = 39,678.98