Finding the Fourth Proportional to 21,026.78, 29,021.16 and 12,080.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,026.78 : 29,021.16 = 12,080.42 : x
2. Step 2: Convert to fraction form
   21,026.78/29,021.16 = 12,080.42/x
3. Step 3: Cross multiply
   21,026.78x = 29,021.16 × 12,080.42
4. Step 4: Simplify right side
   21,026.78x = 350,587,801.69
5. Step 5: Solve for x
   x = 350,587,801.69/21,026.78
6. Step 6: Final answer
   x = 16,673.39