Finding the Fourth Proportional to 21,005.37, 28,987.50 and 11,573.93

Step by Step Solution

1. Step 1: Write the proportion equation
   21,005.37 : 28,987.50 = 11,573.93 : x
2. Step 2: Convert to fraction form
   21,005.37/28,987.50 = 11,573.93/x
3. Step 3: Cross multiply
   21,005.37x = 28,987.50 × 11,573.93
4. Step 4: Simplify right side
   21,005.37x = 335,499,238.01
5. Step 5: Solve for x
   x = 335,499,238.01/21,005.37
6. Step 6: Final answer
   x = 15,972.07