Finding the Third Proportional to 15,511.50 and 20,665.13

Step by Step Solution

1. Step 1: Write the proportion equation
   15,511.50 : 20,665.13 = 20,665.13 : x
2. Step 2: Convert to fraction form
   15,511.50/20,665.13 = 20,665.13/x
3. Step 3: Cross multiply
   15,511.50x = 20,665.13 × 20,665.13
4. Step 4: Simplify right side
   15,511.50x = 427,047,391.27
5. Step 5: Solve for x
   x = 427,047,391.27/15,511.50
6. Step 6: Final answer
   x = 27,531.02