Finding the Fourth Proportional to 8,872.72, 12,239.58 and 5,514.40

Step by Step Solution

1. Step 1: Write the proportion equation
   8,872.72 : 12,239.58 = 5,514.40 : x
2. Step 2: Convert to fraction form
   8,872.72/12,239.58 = 5,514.40/x
3. Step 3: Cross multiply
   8,872.72x = 12,239.58 × 5,514.40
4. Step 4: Simplify right side
   8,872.72x = 67,493,939.95
5. Step 5: Solve for x
   x = 67,493,939.95/8,872.72
6. Step 6: Final answer
   x = 7,606.91