Finding the Fourth Proportional to 5,661.71, 7,811.92 and 3,423.55

Step by Step Solution

1. Step 1: Write the proportion equation
   5,661.71 : 7,811.92 = 3,423.55 : x
2. Step 2: Convert to fraction form
   5,661.71/7,811.92 = 3,423.55/x
3. Step 3: Cross multiply
   5,661.71x = 7,811.92 × 3,423.55
4. Step 4: Simplify right side
   5,661.71x = 26,744,498.72
5. Step 5: Solve for x
   x = 26,744,498.72/5,661.71
6. Step 6: Final answer
   x = 4,723.75