Finding the Fourth Proportional to 21,016.76, 29,003.28 and 11,585.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,016.76 : 29,003.28 = 11,585.48 : x
2. Step 2: Convert to fraction form
   21,016.76/29,003.28 = 11,585.48/x
3. Step 3: Cross multiply
   21,016.76x = 29,003.28 × 11,585.48
4. Step 4: Simplify right side
   21,016.76x = 336,016,920.37
5. Step 5: Solve for x
   x = 336,016,920.37/21,016.76
6. Step 6: Final answer
   x = 15,988.05