Finding the Fourth Proportional to 2,256.05, 3,379.86 and 1,328.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,256.05 : 3,379.86 = 1,328.87 : x
2. Step 2: Convert to fraction form
   2,256.05/3,379.86 = 1,328.87/x
3. Step 3: Cross multiply
   2,256.05x = 3,379.86 × 1,328.87
4. Step 4: Simplify right side
   2,256.05x = 4,491,403.01
5. Step 5: Solve for x
   x = 4,491,403.01/2,256.05
6. Step 6: Final answer
   x = 1,990.82