Finding the Fourth Proportional to 2,891.29, 3,991.46 and 2,005.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,891.29 : 3,991.46 = 2,005.56 : x
2. Step 2: Convert to fraction form
   2,891.29/3,991.46 = 2,005.56/x
3. Step 3: Cross multiply
   2,891.29x = 3,991.46 × 2,005.56
4. Step 4: Simplify right side
   2,891.29x = 8,005,082.53
5. Step 5: Solve for x
   x = 8,005,082.53/2,891.29
6. Step 6: Final answer
   x = 2,768.69