Finding the Fourth Proportional to 2,231.82, 3,078.81 and 1,812.65

Step by Step Solution

1. Step 1: Write the proportion equation
   2,231.82 : 3,078.81 = 1,812.65 : x
2. Step 2: Convert to fraction form
   2,231.82/3,078.81 = 1,812.65/x
3. Step 3: Cross multiply
   2,231.82x = 3,078.81 × 1,812.65
4. Step 4: Simplify right side
   2,231.82x = 5,580,789.55
5. Step 5: Solve for x
   x = 5,580,789.55/2,231.82
6. Step 6: Final answer
   x = 2,500.56