Finding the Fourth Proportional to 2,786.02, 4,178.56 and 1,305.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,786.02 : 4,178.56 = 1,305.40 : x
2. Step 2: Convert to fraction form
   2,786.02/4,178.56 = 1,305.40/x
3. Step 3: Cross multiply
   2,786.02x = 4,178.56 × 1,305.40
4. Step 4: Simplify right side
   2,786.02x = 5,454,692.22
5. Step 5: Solve for x
   x = 5,454,692.22/2,786.02
6. Step 6: Final answer
   x = 1,957.88