Finding the Fourth Proportional to 11,298.78, 16,934.74 and 8,516.27

Step by Step Solution

1. Step 1: Write the proportion equation
   11,298.78 : 16,934.74 = 8,516.27 : x
2. Step 2: Convert to fraction form
   11,298.78/16,934.74 = 8,516.27/x
3. Step 3: Cross multiply
   11,298.78x = 16,934.74 × 8,516.27
4. Step 4: Simplify right side
   11,298.78x = 144,220,839.27
5. Step 5: Solve for x
   x = 144,220,839.27/11,298.78
6. Step 6: Final answer
   x = 12,764.28