Finding the Fourth Proportional to 21,016.56, 29,004.16 and 11,585.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,016.56 : 29,004.16 = 11,585.10 : x
2. Step 2: Convert to fraction form
   21,016.56/29,004.16 = 11,585.10/x
3. Step 3: Cross multiply
   21,016.56x = 29,004.16 × 11,585.10
4. Step 4: Simplify right side
   21,016.56x = 336,016,094.02
5. Step 5: Solve for x
   x = 336,016,094.02/21,016.56
6. Step 6: Final answer
   x = 15,988.16