Finding the Fourth Proportional to 21,569.25, 29,766.78 and 12,138.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,569.25 : 29,766.78 = 12,138.42 : x
2. Step 2: Convert to fraction form
   21,569.25/29,766.78 = 12,138.42/x
3. Step 3: Cross multiply
   21,569.25x = 29,766.78 × 12,138.42
4. Step 4: Simplify right side
   21,569.25x = 361,321,677.69
5. Step 5: Solve for x
   x = 361,321,677.69/21,569.25
6. Step 6: Final answer
   x = 16,751.70