Finding the Fourth Proportional to 21,815.04, 30,105.18 and 12,383.58

Step by Step Solution

1. Step 1: Write the proportion equation
   21,815.04 : 30,105.18 = 12,383.58 : x
2. Step 2: Convert to fraction form
   21,815.04/30,105.18 = 12,383.58/x
3. Step 3: Cross multiply
   21,815.04x = 30,105.18 × 12,383.58
4. Step 4: Simplify right side
   21,815.04x = 372,809,904.94
5. Step 5: Solve for x
   x = 372,809,904.94/21,815.04
6. Step 6: Final answer
   x = 17,089.58