Finding the Fourth Proportional to 2,561.77, 3,843.86 and 1,328.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,561.77 : 3,843.86 = 1,328.51 : x
2. Step 2: Convert to fraction form
   2,561.77/3,843.86 = 1,328.51/x
3. Step 3: Cross multiply
   2,561.77x = 3,843.86 × 1,328.51
4. Step 4: Simplify right side
   2,561.77x = 5,106,606.45
5. Step 5: Solve for x
   x = 5,106,606.45/2,561.77
6. Step 6: Final answer
   x = 1,993.39