Finding the Fourth Proportional to 2,671.23, 4,007.31 and 1,287.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,671.23 : 4,007.31 = 1,287.06 : x
2. Step 2: Convert to fraction form
   2,671.23/4,007.31 = 1,287.06/x
3. Step 3: Cross multiply
   2,671.23x = 4,007.31 × 1,287.06
4. Step 4: Simplify right side
   2,671.23x = 5,157,648.41
5. Step 5: Solve for x
   x = 5,157,648.41/2,671.23
6. Step 6: Final answer
   x = 1,930.81