Finding the Fourth Proportional to 2,891.72, 4,338.39 and 1,161.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,891.72 : 4,338.39 = 1,161.56 : x
2. Step 2: Convert to fraction form
   2,891.72/4,338.39 = 1,161.56/x
3. Step 3: Cross multiply
   2,891.72x = 4,338.39 × 1,161.56
4. Step 4: Simplify right side
   2,891.72x = 5,039,300.29
5. Step 5: Solve for x
   x = 5,039,300.29/2,891.72
6. Step 6: Final answer
   x = 1,742.67