Finding the Fourth Proportional to 21,552.82, 29,742.69 and 12,121.18

Step by Step Solution

1. Step 1: Write the proportion equation
   21,552.82 : 29,742.69 = 12,121.18 : x
2. Step 2: Convert to fraction form
   21,552.82/29,742.69 = 12,121.18/x
3. Step 3: Cross multiply
   21,552.82x = 29,742.69 × 12,121.18
4. Step 4: Simplify right side
   21,552.82x = 360,516,470.27
5. Step 5: Solve for x
   x = 360,516,470.27/21,552.82
6. Step 6: Final answer
   x = 16,727.12