Finding the Fourth Proportional to 2,870.37, 4,280.85 and 2,818.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.37 : 4,280.85 = 2,818.53 : x
2. Step 2: Convert to fraction form
   2,870.37/4,280.85 = 2,818.53/x
3. Step 3: Cross multiply
   2,870.37x = 4,280.85 × 2,818.53
4. Step 4: Simplify right side
   2,870.37x = 12,065,704.15
5. Step 5: Solve for x
   x = 12,065,704.15/2,870.37
6. Step 6: Final answer
   x = 4,203.54