Finding the Fourth Proportional to 12,078.52, 18,121.44 and 5,499.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,078.52 : 18,121.44 = 5,499.28 : x
2. Step 2: Convert to fraction form
   12,078.52/18,121.44 = 5,499.28/x
3. Step 3: Cross multiply
   12,078.52x = 18,121.44 × 5,499.28
4. Step 4: Simplify right side
   12,078.52x = 99,654,872.56
5. Step 5: Solve for x
   x = 99,654,872.56/12,078.52
6. Step 6: Final answer
   x = 8,250.59