Finding the Fourth Proportional to 21,616.80, 29,838.58 and 12,667.16

Step by Step Solution

1. Step 1: Write the proportion equation
   21,616.80 : 29,838.58 = 12,667.16 : x
2. Step 2: Convert to fraction form
   21,616.80/29,838.58 = 12,667.16/x
3. Step 3: Cross multiply
   21,616.80x = 29,838.58 × 12,667.16
4. Step 4: Simplify right side
   21,616.80x = 377,970,067.03
5. Step 5: Solve for x
   x = 377,970,067.03/21,616.80
6. Step 6: Final answer
   x = 17,485.01