Finding the Third Proportional to 11,519.72 and 15,638.91

Step by Step Solution

1. Step 1: Write the proportion equation
   11,519.72 : 15,638.91 = 15,638.91 : x
2. Step 2: Convert to fraction form
   11,519.72/15,638.91 = 15,638.91/x
3. Step 3: Cross multiply
   11,519.72x = 15,638.91 × 15,638.91
4. Step 4: Simplify right side
   11,519.72x = 244,575,388.70
5. Step 5: Solve for x
   x = 244,575,388.70/11,519.72
6. Step 6: Final answer
   x = 21,231.02