Finding the Fourth Proportional to 1,144.12, 1,578.72 and 646.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.12 : 1,578.72 = 646.70 : x
2. Step 2: Convert to fraction form
   1,144.12/1,578.72 = 646.70/x
3. Step 3: Cross multiply
   1,144.12x = 1,578.72 × 646.70
4. Step 4: Simplify right side
   1,144.12x = 1,020,958.22
5. Step 5: Solve for x
   x = 1,020,958.22/1,144.12
6. Step 6: Final answer
   x = 892.35