Finding the Fourth Proportional to 11,872.78, 16,379.72 and 7,622.91

Step by Step Solution

1. Step 1: Write the proportion equation
   11,872.78 : 16,379.72 = 7,622.91 : x
2. Step 2: Convert to fraction form
   11,872.78/16,379.72 = 7,622.91/x
3. Step 3: Cross multiply
   11,872.78x = 16,379.72 × 7,622.91
4. Step 4: Simplify right side
   11,872.78x = 124,861,121.86
5. Step 5: Solve for x
   x = 124,861,121.86/11,872.78
6. Step 6: Final answer
   x = 10,516.59