Finding the Fourth Proportional to 21,367.34, 29,474.60 and 12,863.55

Step by Step Solution

1. Step 1: Write the proportion equation
   21,367.34 : 29,474.60 = 12,863.55 : x
2. Step 2: Convert to fraction form
   21,367.34/29,474.60 = 12,863.55/x
3. Step 3: Cross multiply
   21,367.34x = 29,474.60 × 12,863.55
4. Step 4: Simplify right side
   21,367.34x = 379,147,990.83
5. Step 5: Solve for x
   x = 379,147,990.83/21,367.34
6. Step 6: Final answer
   x = 17,744.28