Finding the Fourth Proportional to 12,078.12, 18,144.84 and 7,151.16

Step by Step Solution

1. Step 1: Write the proportion equation
   12,078.12 : 18,144.84 = 7,151.16 : x
2. Step 2: Convert to fraction form
   12,078.12/18,144.84 = 7,151.16/x
3. Step 3: Cross multiply
   12,078.12x = 18,144.84 × 7,151.16
4. Step 4: Simplify right side
   12,078.12x = 129,756,654.01
5. Step 5: Solve for x
   x = 129,756,654.01/12,078.12
6. Step 6: Final answer
   x = 10,743.12