Finding the Fourth Proportional to 21,721.76, 32,519.20 and 13,376.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,721.76 : 32,519.20 = 13,376.72 : x
2. Step 2: Convert to fraction form
   21,721.76/32,519.20 = 13,376.72/x
3. Step 3: Cross multiply
   21,721.76x = 32,519.20 × 13,376.72
4. Step 4: Simplify right side
   21,721.76x = 435,000,233.02
5. Step 5: Solve for x
   x = 435,000,233.02/21,721.76
6. Step 6: Final answer
   x = 20,026.01