Finding the Fourth Proportional to 1,639.23, 2,264.79 and 1,144.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,639.23 : 2,264.79 = 1,144.08 : x
2. Step 2: Convert to fraction form
   1,639.23/2,264.79 = 1,144.08/x
3. Step 3: Cross multiply
   1,639.23x = 2,264.79 × 1,144.08
4. Step 4: Simplify right side
   1,639.23x = 2,591,100.94
5. Step 5: Solve for x
   x = 2,591,100.94/1,639.23
6. Step 6: Final answer
   x = 1,580.68