Finding the Fourth Proportional to 21,555, 29,747.61 and 12,124.26

Step by Step Solution

1. Step 1: Write the proportion equation
   21,555 : 29,747.61 = 12,124.26 : x
2. Step 2: Convert to fraction form
   21,555/29,747.61 = 12,124.26/x
3. Step 3: Cross multiply
   21,555x = 29,747.61 × 12,124.26
4. Step 4: Simplify right side
   21,555x = 360,667,758.02
5. Step 5: Solve for x
   x = 360,667,758.02/21,555
6. Step 6: Final answer
   x = 16,732.44