Finding the Fourth Proportional to 2,589.56, 3,880.38 and 1,291.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,589.56 : 3,880.38 = 1,291.76 : x
2. Step 2: Convert to fraction form
   2,589.56/3,880.38 = 1,291.76/x
3. Step 3: Cross multiply
   2,589.56x = 3,880.38 × 1,291.76
4. Step 4: Simplify right side
   2,589.56x = 5,012,519.67
5. Step 5: Solve for x
   x = 5,012,519.67/2,589.56
6. Step 6: Final answer
   x = 1,935.66