Finding the Fourth Proportional to 12,048.46, 18,078.15 and 7,127.71

Step by Step Solution

1. Step 1: Write the proportion equation
   12,048.46 : 18,078.15 = 7,127.71 : x
2. Step 2: Convert to fraction form
   12,048.46/18,078.15 = 7,127.71/x
3. Step 3: Cross multiply
   12,048.46x = 18,078.15 × 7,127.71
4. Step 4: Simplify right side
   12,048.46x = 128,855,810.54
5. Step 5: Solve for x
   x = 128,855,810.54/12,048.46
6. Step 6: Final answer
   x = 10,694.80