Finding the Fourth Proportional to 21,100.78, 29,119.38 and 11,669.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,100.78 : 29,119.38 = 11,669.32 : x
2. Step 2: Convert to fraction form
   21,100.78/29,119.38 = 11,669.32/x
3. Step 3: Cross multiply
   21,100.78x = 29,119.38 × 11,669.32
4. Step 4: Simplify right side
   21,100.78x = 339,803,363.42
5. Step 5: Solve for x
   x = 339,803,363.42/21,100.78
6. Step 6: Final answer
   x = 16,103.83