Finding the Fourth Proportional to 12,005.31, 18,007.92 and 3,239.58

Step by Step Solution

1. Step 1: Write the proportion equation
   12,005.31 : 18,007.92 = 3,239.58 : x
2. Step 2: Convert to fraction form
   12,005.31/18,007.92 = 3,239.58/x
3. Step 3: Cross multiply
   12,005.31x = 18,007.92 × 3,239.58
4. Step 4: Simplify right side
   12,005.31x = 58,338,097.47
5. Step 5: Solve for x
   x = 58,338,097.47/12,005.31
6. Step 6: Final answer
   x = 4,859.36