Finding the Fourth Proportional to 21,096.78, 29,108.73 and 12,142.63

Step by Step Solution

1. Step 1: Write the proportion equation
   21,096.78 : 29,108.73 = 12,142.63 : x
2. Step 2: Convert to fraction form
   21,096.78/29,108.73 = 12,142.63/x
3. Step 3: Cross multiply
   21,096.78x = 29,108.73 × 12,142.63
4. Step 4: Simplify right side
   21,096.78x = 353,456,538.16
5. Step 5: Solve for x
   x = 353,456,538.16/21,096.78
6. Step 6: Final answer
   x = 16,754.05