Finding the Fourth Proportional to 21,859.12, 30,168.35 and 12,425.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,859.12 : 30,168.35 = 12,425.86 : x
2. Step 2: Convert to fraction form
   21,859.12/30,168.35 = 12,425.86/x
3. Step 3: Cross multiply
   21,859.12x = 30,168.35 × 12,425.86
4. Step 4: Simplify right side
   21,859.12x = 374,867,693.53
5. Step 5: Solve for x
   x = 374,867,693.53/21,859.12
6. Step 6: Final answer
   x = 17,149.26