Finding the Fourth Proportional to 21,025.78, 29,019.78 and 12,079.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,025.78 : 29,019.78 = 12,079.42 : x
2. Step 2: Convert to fraction form
   21,025.78/29,019.78 = 12,079.42/x
3. Step 3: Cross multiply
   21,025.78x = 29,019.78 × 12,079.42
4. Step 4: Simplify right side
   21,025.78x = 350,542,110.93
5. Step 5: Solve for x
   x = 350,542,110.93/21,025.78
6. Step 6: Final answer
   x = 16,672.01