Finding the Fourth Proportional to 21,801.96, 30,092.46 and 12,855.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,801.96 : 30,092.46 = 12,855.42 : x
2. Step 2: Convert to fraction form
   21,801.96/30,092.46 = 12,855.42/x
3. Step 3: Cross multiply
   21,801.96x = 30,092.46 × 12,855.42
4. Step 4: Simplify right side
   21,801.96x = 386,851,147.86
5. Step 5: Solve for x
   x = 386,851,147.86/21,801.96
6. Step 6: Final answer
   x = 17,743.87