Finding the Fourth Proportional to 21,150.12, 29,185.56 and 11,718.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,150.12 : 29,185.56 = 11,718.48 : x
2. Step 2: Convert to fraction form
   21,150.12/29,185.56 = 11,718.48/x
3. Step 3: Cross multiply
   21,150.12x = 29,185.56 × 11,718.48
4. Step 4: Simplify right side
   21,150.12x = 342,010,401.15
5. Step 5: Solve for x
   x = 342,010,401.15/21,150.12
6. Step 6: Final answer
   x = 16,170.61