Finding the Fourth Proportional to 2,818.42, 3,889.89 and 1,640.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,818.42 : 3,889.89 = 1,640.18 : x
2. Step 2: Convert to fraction form
   2,818.42/3,889.89 = 1,640.18/x
3. Step 3: Cross multiply
   2,818.42x = 3,889.89 × 1,640.18
4. Step 4: Simplify right side
   2,818.42x = 6,380,129.50
5. Step 5: Solve for x
   x = 6,380,129.50/2,818.42
6. Step 6: Final answer
   x = 2,263.73