Finding the Fourth Proportional to 8,872.91, 12,233.72 and 7,188.11

Step by Step Solution

1. Step 1: Write the proportion equation
   8,872.91 : 12,233.72 = 7,188.11 : x
2. Step 2: Convert to fraction form
   8,872.91/12,233.72 = 7,188.11/x
3. Step 3: Cross multiply
   8,872.91x = 12,233.72 × 7,188.11
4. Step 4: Simplify right side
   8,872.91x = 87,937,227.96
5. Step 5: Solve for x
   x = 87,937,227.96/8,872.91
6. Step 6: Final answer
   x = 9,910.76