Finding the Fourth Proportional to 21,818.36, 30,105.27 and 12,868.67

Step by Step Solution

1. Step 1: Write the proportion equation
   21,818.36 : 30,105.27 = 12,868.67 : x
2. Step 2: Convert to fraction form
   21,818.36/30,105.27 = 12,868.67/x
3. Step 3: Cross multiply
   21,818.36x = 30,105.27 × 12,868.67
4. Step 4: Simplify right side
   21,818.36x = 387,414,860.15
5. Step 5: Solve for x
   x = 387,414,860.15/21,818.36
6. Step 6: Final answer
   x = 17,756.37