Finding the Fourth Proportional to 15,499.28, 21,359.76 and 12,136.52

Step by Step Solution

1. Step 1: Write the proportion equation
   15,499.28 : 21,359.76 = 12,136.52 : x
2. Step 2: Convert to fraction form
   15,499.28/21,359.76 = 12,136.52/x
3. Step 3: Cross multiply
   15,499.28x = 21,359.76 × 12,136.52
4. Step 4: Simplify right side
   15,499.28x = 259,233,154.44
5. Step 5: Solve for x
   x = 259,233,154.44/15,499.28
6. Step 6: Final answer
   x = 16,725.50