Finding the Fourth Proportional to 2,876.69, 4,311.42 and 1,231.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,876.69 : 4,311.42 = 1,231.31 : x
2. Step 2: Convert to fraction form
   2,876.69/4,311.42 = 1,231.31/x
3. Step 3: Cross multiply
   2,876.69x = 4,311.42 × 1,231.31
4. Step 4: Simplify right side
   2,876.69x = 5,308,673.00
5. Step 5: Solve for x
   x = 5,308,673.00/2,876.69
6. Step 6: Final answer
   x = 1,845.41