Finding the Fourth Proportional to 2,870.40, 4,282.62 and 2,558.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.40 : 4,282.62 = 2,558.55 : x
2. Step 2: Convert to fraction form
   2,870.40/4,282.62 = 2,558.55/x
3. Step 3: Cross multiply
   2,870.40x = 4,282.62 × 2,558.55
4. Step 4: Simplify right side
   2,870.40x = 10,957,297.40
5. Step 5: Solve for x
   x = 10,957,297.40/2,870.40
6. Step 6: Final answer
   x = 3,817.34