Finding the Fourth Proportional to 21,128.53, 29,157.83 and 11,568.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,128.53 : 29,157.83 = 11,568.82 : x
2. Step 2: Convert to fraction form
   21,128.53/29,157.83 = 11,568.82/x
3. Step 3: Cross multiply
   21,128.53x = 29,157.83 × 11,568.82
4. Step 4: Simplify right side
   21,128.53x = 337,321,686.86
5. Step 5: Solve for x
   x = 337,321,686.86/21,128.53
6. Step 6: Final answer
   x = 15,965.22