Finding the Fourth Proportional to 8,505.54, 12,758.24 and 3,311.42

Step by Step Solution

1. Step 1: Write the proportion equation
   8,505.54 : 12,758.24 = 3,311.42 : x
2. Step 2: Convert to fraction form
   8,505.54/12,758.24 = 3,311.42/x
3. Step 3: Cross multiply
   8,505.54x = 12,758.24 × 3,311.42
4. Step 4: Simplify right side
   8,505.54x = 42,247,835.59
5. Step 5: Solve for x
   x = 42,247,835.59/8,505.54
6. Step 6: Final answer
   x = 4,967.10