Finding the Fourth Proportional to 11,778.72, 16,242.30 and 8,789.76

Step by Step Solution

1. Step 1: Write the proportion equation
   11,778.72 : 16,242.30 = 8,789.76 : x
2. Step 2: Convert to fraction form
   11,778.72/16,242.30 = 8,789.76/x
3. Step 3: Cross multiply
   11,778.72x = 16,242.30 × 8,789.76
4. Step 4: Simplify right side
   11,778.72x = 142,765,918.85
5. Step 5: Solve for x
   x = 142,765,918.85/11,778.72
6. Step 6: Final answer
   x = 12,120.66