Finding the Fourth Proportional to 21,305.93, 29,401.61 and 12,231.03

Step by Step Solution

1. Step 1: Write the proportion equation
   21,305.93 : 29,401.61 = 12,231.03 : x
2. Step 2: Convert to fraction form
   21,305.93/29,401.61 = 12,231.03/x
3. Step 3: Cross multiply
   21,305.93x = 29,401.61 × 12,231.03
4. Step 4: Simplify right side
   21,305.93x = 359,612,004.54
5. Step 5: Solve for x
   x = 359,612,004.54/21,305.93
6. Step 6: Final answer
   x = 16,878.49