Finding the Fourth Proportional to 21,086.96, 29,100.03 and 12,134.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,086.96 : 29,100.03 = 12,134.28 : x
2. Step 2: Convert to fraction form
   21,086.96/29,100.03 = 12,134.28/x
3. Step 3: Cross multiply
   21,086.96x = 29,100.03 × 12,134.28
4. Step 4: Simplify right side
   21,086.96x = 353,107,912.03
5. Step 5: Solve for x
   x = 353,107,912.03/21,086.96
6. Step 6: Final answer
   x = 16,745.32