Finding the Fourth Proportional to 12,078.88, 18,120.42 and 4,072.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,078.88 : 18,120.42 = 4,072.89 : x
2. Step 2: Convert to fraction form
   12,078.88/18,120.42 = 4,072.89/x
3. Step 3: Cross multiply
   12,078.88x = 18,120.42 × 4,072.89
4. Step 4: Simplify right side
   12,078.88x = 73,802,477.41
5. Step 5: Solve for x
   x = 73,802,477.41/12,078.88
6. Step 6: Final answer
   x = 6,110.04