Finding the Fourth Proportional to 11,928.83, 16,477.28 and 9,078.89

Step by Step Solution

1. Step 1: Write the proportion equation
   11,928.83 : 16,477.28 = 9,078.89 : x
2. Step 2: Convert to fraction form
   11,928.83/16,477.28 = 9,078.89/x
3. Step 3: Cross multiply
   11,928.83x = 16,477.28 × 9,078.89
4. Step 4: Simplify right side
   11,928.83x = 149,595,326.03
5. Step 5: Solve for x
   x = 149,595,326.03/11,928.83
6. Step 6: Final answer
   x = 12,540.66