Finding the Fourth Proportional to 13,005.43, 19,519.08 and 12,185.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,005.43 : 19,519.08 = 12,185.31 : x
2. Step 2: Convert to fraction form
   13,005.43/19,519.08 = 12,185.31/x
3. Step 3: Cross multiply
   13,005.43x = 19,519.08 × 12,185.31
4. Step 4: Simplify right side
   13,005.43x = 237,846,040.71
5. Step 5: Solve for x
   x = 237,846,040.71/13,005.43
6. Step 6: Final answer
   x = 18,288.21