Finding the Fourth Proportional to 1,144.03, 1,578.90 and 646.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.03 : 1,578.90 = 646.69 : x
2. Step 2: Convert to fraction form
   1,144.03/1,578.90 = 646.69/x
3. Step 3: Cross multiply
   1,144.03x = 1,578.90 × 646.69
4. Step 4: Simplify right side
   1,144.03x = 1,021,058.84
5. Step 5: Solve for x
   x = 1,021,058.84/1,144.03
6. Step 6: Final answer
   x = 892.51