Finding the Fourth Proportional to 2,978.34, 4,080.27 and 2,867.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.34 : 4,080.27 = 2,867.55 : x
2. Step 2: Convert to fraction form
   2,978.34/4,080.27 = 2,867.55/x
3. Step 3: Cross multiply
   2,978.34x = 4,080.27 × 2,867.55
4. Step 4: Simplify right side
   2,978.34x = 11,700,378.24
5. Step 5: Solve for x
   x = 11,700,378.24/2,978.34
6. Step 6: Final answer
   x = 3,928.49