Finding the Fourth Proportional to 6,221.27, 9,311.56 and 3,405.87

Step by Step Solution

1. Step 1: Write the proportion equation
   6,221.27 : 9,311.56 = 3,405.87 : x
2. Step 2: Convert to fraction form
   6,221.27/9,311.56 = 3,405.87/x
3. Step 3: Cross multiply
   6,221.27x = 9,311.56 × 3,405.87
4. Step 4: Simplify right side
   6,221.27x = 31,713,945.83
5. Step 5: Solve for x
   x = 31,713,945.83/6,221.27
6. Step 6: Final answer
   x = 5,097.66