Finding the Fourth Proportional to 21,016.58, 29,003.02 and 11,585.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,016.58 : 29,003.02 = 11,585.15 : x
2. Step 2: Convert to fraction form
   21,016.58/29,003.02 = 11,585.15/x
3. Step 3: Cross multiply
   21,016.58x = 29,003.02 × 11,585.15
4. Step 4: Simplify right side
   21,016.58x = 336,004,337.15
5. Step 5: Solve for x
   x = 336,004,337.15/21,016.58
6. Step 6: Final answer
   x = 15,987.58