Finding the Fourth Proportional to 2,561.76, 3,843.42 and 1,330.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,561.76 : 3,843.42 = 1,330.05 : x
2. Step 2: Convert to fraction form
   2,561.76/3,843.42 = 1,330.05/x
3. Step 3: Cross multiply
   2,561.76x = 3,843.42 × 1,330.05
4. Step 4: Simplify right side
   2,561.76x = 5,111,940.77
5. Step 5: Solve for x
   x = 5,111,940.77/2,561.76
6. Step 6: Final answer
   x = 1,995.48