Finding the Fourth Proportional to 2,891.88, 3,980.64 and 2,559.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,891.88 : 3,980.64 = 2,559.72 : x
2. Step 2: Convert to fraction form
   2,891.88/3,980.64 = 2,559.72/x
3. Step 3: Cross multiply
   2,891.88x = 3,980.64 × 2,559.72
4. Step 4: Simplify right side
   2,891.88x = 10,189,323.82
5. Step 5: Solve for x
   x = 10,189,323.82/2,891.88
6. Step 6: Final answer
   x = 3,523.43