Finding the Fourth Proportional to 2,801.57, 3,866.41 and 1,542.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,801.57 : 3,866.41 = 1,542.87 : x
2. Step 2: Convert to fraction form
   2,801.57/3,866.41 = 1,542.87/x
3. Step 3: Cross multiply
   2,801.57x = 3,866.41 × 1,542.87
4. Step 4: Simplify right side
   2,801.57x = 5,965,360.28
5. Step 5: Solve for x
   x = 5,965,360.28/2,801.57
6. Step 6: Final answer
   x = 2,129.29