Finding the Fourth Proportional to 2,857.57, 4,287.72 and 1,395.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,857.57 : 4,287.72 = 1,395.91 : x
2. Step 2: Convert to fraction form
   2,857.57/4,287.72 = 1,395.91/x
3. Step 3: Cross multiply
   2,857.57x = 4,287.72 × 1,395.91
4. Step 4: Simplify right side
   2,857.57x = 5,985,271.23
5. Step 5: Solve for x
   x = 5,985,271.23/2,857.57
6. Step 6: Final answer
   x = 2,094.53