Finding the Fourth Proportional to 21,108.94, 29,118.82 and 13,556.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,108.94 : 29,118.82 = 13,556.42 : x
2. Step 2: Convert to fraction form
   21,108.94/29,118.82 = 13,556.42/x
3. Step 3: Cross multiply
   21,108.94x = 29,118.82 × 13,556.42
4. Step 4: Simplify right side
   21,108.94x = 394,746,952.72
5. Step 5: Solve for x
   x = 394,746,952.72/21,108.94
6. Step 6: Final answer
   x = 18,700.47