Finding the Fourth Proportional to 21,196.79, 29,235.28 and 15,529.49

Step by Step Solution

1. Step 1: Write the proportion equation
   21,196.79 : 29,235.28 = 15,529.49 : x
2. Step 2: Convert to fraction form
   21,196.79/29,235.28 = 15,529.49/x
3. Step 3: Cross multiply
   21,196.79x = 29,235.28 × 15,529.49
4. Step 4: Simplify right side
   21,196.79x = 454,008,764.58
5. Step 5: Solve for x
   x = 454,008,764.58/21,196.79
6. Step 6: Final answer
   x = 21,418.76