Finding the Fourth Proportional to 11,771.45, 16,255.15 and 8,782.10

Step by Step Solution

1. Step 1: Write the proportion equation
   11,771.45 : 16,255.15 = 8,782.10 : x
2. Step 2: Convert to fraction form
   11,771.45/16,255.15 = 8,782.10/x
3. Step 3: Cross multiply
   11,771.45x = 16,255.15 × 8,782.10
4. Step 4: Simplify right side
   11,771.45x = 142,754,249.58
5. Step 5: Solve for x
   x = 142,754,249.58/11,771.45
6. Step 6: Final answer
   x = 12,127.16