Finding the Fourth Proportional to 21,100.76, 29,118.60 and 11,669.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,100.76 : 29,118.60 = 11,669.48 : x
2. Step 2: Convert to fraction form
   21,100.76/29,118.60 = 11,669.48/x
3. Step 3: Cross multiply
   21,100.76x = 29,118.60 × 11,669.48
4. Step 4: Simplify right side
   21,100.76x = 339,798,920.33
5. Step 5: Solve for x
   x = 339,798,920.33/21,100.76
6. Step 6: Final answer
   x = 16,103.63