Finding the Fourth Proportional to 21,105.78, 29,124.44 and 11,674.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,105.78 : 29,124.44 = 11,674.50 : x
2. Step 2: Convert to fraction form
   21,105.78/29,124.44 = 11,674.50/x
3. Step 3: Cross multiply
   21,105.78x = 29,124.44 × 11,674.50
4. Step 4: Simplify right side
   21,105.78x = 340,013,274.78
5. Step 5: Solve for x
   x = 340,013,274.78/21,105.78
6. Step 6: Final answer
   x = 16,109.96