Finding the Fourth Proportional to 14,436, 21,617.28 and 13,104.72

Step by Step Solution

1. Step 1: Write the proportion equation
   14,436 : 21,617.28 = 13,104.72 : x
2. Step 2: Convert to fraction form
   14,436/21,617.28 = 13,104.72/x
3. Step 3: Cross multiply
   14,436x = 21,617.28 × 13,104.72
4. Step 4: Simplify right side
   14,436x = 283,288,401.56
5. Step 5: Solve for x
   x = 283,288,401.56/14,436
6. Step 6: Final answer
   x = 19,623.75