Finding the Fourth Proportional to 6,613.42, 9,920.52 and 2,171.38

Step by Step Solution

1. Step 1: Write the proportion equation
   6,613.42 : 9,920.52 = 2,171.38 : x
2. Step 2: Convert to fraction form
   6,613.42/9,920.52 = 2,171.38/x
3. Step 3: Cross multiply
   6,613.42x = 9,920.52 × 2,171.38
4. Step 4: Simplify right side
   6,613.42x = 21,541,218.72
5. Step 5: Solve for x
   x = 21,541,218.72/6,613.42
6. Step 6: Final answer
   x = 3,257.20