Finding the Fourth Proportional to 21,196.28, 29,234.59 and 15,528.98

Step by Step Solution

1. Step 1: Write the proportion equation
   21,196.28 : 29,234.59 = 15,528.98 : x
2. Step 2: Convert to fraction form
   21,196.28/29,234.59 = 15,528.98/x
3. Step 3: Cross multiply
   21,196.28x = 29,234.59 × 15,528.98
4. Step 4: Simplify right side
   21,196.28x = 453,983,397.68
5. Step 5: Solve for x
   x = 453,983,397.68/21,196.28
6. Step 6: Final answer
   x = 21,418.07