Finding the Fourth Proportional to 21,004.88, 28,986.72 and 11,573.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,004.88 : 28,986.72 = 11,573.42 : x
2. Step 2: Convert to fraction form
   21,004.88/28,986.72 = 11,573.42/x
3. Step 3: Cross multiply
   21,004.88x = 28,986.72 × 11,573.42
4. Step 4: Simplify right side
   21,004.88x = 335,475,484.98
5. Step 5: Solve for x
   x = 335,475,484.98/21,004.88
6. Step 6: Final answer
   x = 15,971.31