Finding the Fourth Proportional to 2,870.61, 3,963.78 and 2,339.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.61 : 3,963.78 = 2,339.57 : x
2. Step 2: Convert to fraction form
   2,870.61/3,963.78 = 2,339.57/x
3. Step 3: Cross multiply
   2,870.61x = 3,963.78 × 2,339.57
4. Step 4: Simplify right side
   2,870.61x = 9,273,529.08
5. Step 5: Solve for x
   x = 9,273,529.08/2,870.61
6. Step 6: Final answer
   x = 3,230.51