Finding the Fourth Proportional to 8,086.54, 11,146.72 and 7,408.58

Step by Step Solution

1. Step 1: Write the proportion equation
   8,086.54 : 11,146.72 = 7,408.58 : x
2. Step 2: Convert to fraction form
   8,086.54/11,146.72 = 7,408.58/x
3. Step 3: Cross multiply
   8,086.54x = 11,146.72 × 7,408.58
4. Step 4: Simplify right side
   8,086.54x = 82,581,366.86
5. Step 5: Solve for x
   x = 82,581,366.86/8,086.54
6. Step 6: Final answer
   x = 10,212.20