Finding the Fourth Proportional to 8,577.37, 12,864.72 and 3,311.61

Step by Step Solution

1. Step 1: Write the proportion equation
   8,577.37 : 12,864.72 = 3,311.61 : x
2. Step 2: Convert to fraction form
   8,577.37/12,864.72 = 3,311.61/x
3. Step 3: Cross multiply
   8,577.37x = 12,864.72 × 3,311.61
4. Step 4: Simplify right side
   8,577.37x = 42,602,935.40
5. Step 5: Solve for x
   x = 42,602,935.40/8,577.37
6. Step 6: Final answer
   x = 4,966.90