Finding the Fourth Proportional to 21,819.60, 30,103.20 and 13,863.60

Step by Step Solution

1. Step 1: Write the proportion equation
   21,819.60 : 30,103.20 = 13,863.60 : x
2. Step 2: Convert to fraction form
   21,819.60/30,103.20 = 13,863.60/x
3. Step 3: Cross multiply
   21,819.60x = 30,103.20 × 13,863.60
4. Step 4: Simplify right side
   21,819.60x = 417,338,723.52
5. Step 5: Solve for x
   x = 417,338,723.52/21,819.60
6. Step 6: Final answer
   x = 19,126.78