Finding the Fourth Proportional to 2,859, 3,942.72 and 1,865.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,859 : 3,942.72 = 1,865.04 : x
2. Step 2: Convert to fraction form
   2,859/3,942.72 = 1,865.04/x
3. Step 3: Cross multiply
   2,859x = 3,942.72 × 1,865.04
4. Step 4: Simplify right side
   2,859x = 7,353,330.51
5. Step 5: Solve for x
   x = 7,353,330.51/2,859
6. Step 6: Final answer
   x = 2,571.99