Finding the Fourth Proportional to 3,968.55, 5,476.71 and 2,290.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,968.55 : 5,476.71 = 2,290.05 : x
2. Step 2: Convert to fraction form
   3,968.55/5,476.71 = 2,290.05/x
3. Step 3: Cross multiply
   3,968.55x = 5,476.71 × 2,290.05
4. Step 4: Simplify right side
   3,968.55x = 12,541,939.74
5. Step 5: Solve for x
   x = 12,541,939.74/3,968.55
6. Step 6: Final answer
   x = 3,160.33