Finding the Fourth Proportional to 1,144.18, 1,578.91 and 646.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.18 : 1,578.91 = 646.79 : x
2. Step 2: Convert to fraction form
   1,144.18/1,578.91 = 646.79/x
3. Step 3: Cross multiply
   1,144.18x = 1,578.91 × 646.79
4. Step 4: Simplify right side
   1,144.18x = 1,021,223.78
5. Step 5: Solve for x
   x = 1,021,223.78/1,144.18
6. Step 6: Final answer
   x = 892.54