Finding the Fourth Proportional to 1,642.57, 2,262.89 and 1,144.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,642.57 : 2,262.89 = 1,144.31 : x
2. Step 2: Convert to fraction form
   1,642.57/2,262.89 = 1,144.31/x
3. Step 3: Cross multiply
   1,642.57x = 2,262.89 × 1,144.31
4. Step 4: Simplify right side
   1,642.57x = 2,589,439.20
5. Step 5: Solve for x
   x = 2,589,439.20/1,642.57
6. Step 6: Final answer
   x = 1,576.46