Finding the Fourth Proportional to 21,065.78, 29,076.56 and 13,103.24

Step by Step Solution

1. Step 1: Write the proportion equation
   21,065.78 : 29,076.56 = 13,103.24 : x
2. Step 2: Convert to fraction form
   21,065.78/29,076.56 = 13,103.24/x
3. Step 3: Cross multiply
   21,065.78x = 29,076.56 × 13,103.24
4. Step 4: Simplify right side
   21,065.78x = 380,997,144.05
5. Step 5: Solve for x
   x = 380,997,144.05/21,065.78
6. Step 6: Final answer
   x = 18,086.07