Finding the Fourth Proportional to 21,104.78, 29,123.06 and 11,673.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,104.78 : 29,123.06 = 11,673.50 : x
2. Step 2: Convert to fraction form
   21,104.78/29,123.06 = 11,673.50/x
3. Step 3: Cross multiply
   21,104.78x = 29,123.06 × 11,673.50
4. Step 4: Simplify right side
   21,104.78x = 339,968,040.91
5. Step 5: Solve for x
   x = 339,968,040.91/21,104.78
6. Step 6: Final answer
   x = 16,108.58