Finding the Fourth Proportional to 2,891.20, 3,989.89 and 1,756.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,891.20 : 3,989.89 = 1,756.54 : x
2. Step 2: Convert to fraction form
   2,891.20/3,989.89 = 1,756.54/x
3. Step 3: Cross multiply
   2,891.20x = 3,989.89 × 1,756.54
4. Step 4: Simplify right side
   2,891.20x = 7,008,401.38
5. Step 5: Solve for x
   x = 7,008,401.38/2,891.20
6. Step 6: Final answer
   x = 2,424.05