Finding the Fourth Proportional to 21,013.72, 29,040.74 and 17,231.02

Step by Step Solution

1. Step 1: Write the proportion equation
   21,013.72 : 29,040.74 = 17,231.02 : x
2. Step 2: Convert to fraction form
   21,013.72/29,040.74 = 17,231.02/x
3. Step 3: Cross multiply
   21,013.72x = 29,040.74 × 17,231.02
4. Step 4: Simplify right side
   21,013.72x = 500,401,485.60
5. Step 5: Solve for x
   x = 500,401,485.60/21,013.72
6. Step 6: Final answer
   x = 23,813.08