Finding the Fourth Proportional to 2,641.80, 3,963.83 and 1,256.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,641.80 : 3,963.83 = 1,256.12 : x
2. Step 2: Convert to fraction form
   2,641.80/3,963.83 = 1,256.12/x
3. Step 3: Cross multiply
   2,641.80x = 3,963.83 × 1,256.12
4. Step 4: Simplify right side
   2,641.80x = 4,979,029.46
5. Step 5: Solve for x
   x = 4,979,029.46/2,641.80
6. Step 6: Final answer
   x = 1,884.71