Finding the Third Proportional to 15,511.50 and 20,806.88

Step by Step Solution

1. Step 1: Write the proportion equation
   15,511.50 : 20,806.88 = 20,806.88 : x
2. Step 2: Convert to fraction form
   15,511.50/20,806.88 = 20,806.88/x
3. Step 3: Cross multiply
   15,511.50x = 20,806.88 × 20,806.88
4. Step 4: Simplify right side
   15,511.50x = 432,926,047.27
5. Step 5: Solve for x
   x = 432,926,047.27/15,511.50
6. Step 6: Final answer
   x = 27,910.01