Finding the Fourth Proportional to 21,100.71, 29,118.20 and 11,669.43

Step by Step Solution

1. Step 1: Write the proportion equation
   21,100.71 : 29,118.20 = 11,669.43 : x
2. Step 2: Convert to fraction form
   21,100.71/29,118.20 = 11,669.43/x
3. Step 3: Cross multiply
   21,100.71x = 29,118.20 × 11,669.43
4. Step 4: Simplify right side
   21,100.71x = 339,792,738.28
5. Step 5: Solve for x
   x = 339,792,738.28/21,100.71
6. Step 6: Final answer
   x = 16,103.38