Finding the Fourth Proportional to 21,815.76, 30,105.36 and 12,384.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,815.76 : 30,105.36 = 12,384.12 : x
2. Step 2: Convert to fraction form
   21,815.76/30,105.36 = 12,384.12/x
3. Step 3: Cross multiply
   21,815.76x = 30,105.36 × 12,384.12
4. Step 4: Simplify right side
   21,815.76x = 372,828,390.88
5. Step 5: Solve for x
   x = 372,828,390.88/21,815.76
6. Step 6: Final answer
   x = 17,089.86