Finding the Fourth Proportional to 1,144.04, 1,578.79 and 646.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.04 : 1,578.79 = 646.69 : x
2. Step 2: Convert to fraction form
   1,144.04/1,578.79 = 646.69/x
3. Step 3: Cross multiply
   1,144.04x = 1,578.79 × 646.69
4. Step 4: Simplify right side
   1,144.04x = 1,020,979.81
5. Step 5: Solve for x
   x = 1,020,979.81/1,144.04
6. Step 6: Final answer
   x = 892.43