Finding the Fourth Proportional to 12,081.78, 18,127.29 and 4,691.43

Step by Step Solution

1. Step 1: Write the proportion equation
   12,081.78 : 18,127.29 = 4,691.43 : x
2. Step 2: Convert to fraction form
   12,081.78/18,127.29 = 4,691.43/x
3. Step 3: Cross multiply
   12,081.78x = 18,127.29 × 4,691.43
4. Step 4: Simplify right side
   12,081.78x = 85,042,912.12
5. Step 5: Solve for x
   x = 85,042,912.12/12,081.78
6. Step 6: Final answer
   x = 7,038.94