Finding the Fourth Proportional to 2,826.78, 3,898.58 and 1,818.65

Step by Step Solution

1. Step 1: Write the proportion equation
   2,826.78 : 3,898.58 = 1,818.65 : x
2. Step 2: Convert to fraction form
   2,826.78/3,898.58 = 1,818.65/x
3. Step 3: Cross multiply
   2,826.78x = 3,898.58 × 1,818.65
4. Step 4: Simplify right side
   2,826.78x = 7,090,123.93
5. Step 5: Solve for x
   x = 7,090,123.93/2,826.78
6. Step 6: Final answer
   x = 2,508.20