Finding the Fourth Proportional to 3,971.39, 5,479.61 and 2,555.55

Step by Step Solution

1. Step 1: Write the proportion equation
   3,971.39 : 5,479.61 = 2,555.55 : x
2. Step 2: Convert to fraction form
   3,971.39/5,479.61 = 2,555.55/x
3. Step 3: Cross multiply
   3,971.39x = 5,479.61 × 2,555.55
4. Step 4: Simplify right side
   3,971.39x = 14,003,404.56
5. Step 5: Solve for x
   x = 14,003,404.56/3,971.39
6. Step 6: Final answer
   x = 3,526.08