Finding the Fourth Proportional to 21,016.78, 29,003.22 and 11,585.14

Step by Step Solution

1. Step 1: Write the proportion equation
   21,016.78 : 29,003.22 = 11,585.14 : x
2. Step 2: Convert to fraction form
   21,016.78/29,003.22 = 11,585.14/x
3. Step 3: Cross multiply
   21,016.78x = 29,003.22 × 11,585.14
4. Step 4: Simplify right side
   21,016.78x = 336,006,364.15
5. Step 5: Solve for x
   x = 336,006,364.15/21,016.78
6. Step 6: Final answer
   x = 15,987.53