Finding the Fourth Proportional to 1,143.42, 1,578.15 and 677.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,143.42 : 1,578.15 = 677.94 : x
2. Step 2: Convert to fraction form
   1,143.42/1,578.15 = 677.94/x
3. Step 3: Cross multiply
   1,143.42x = 1,578.15 × 677.94
4. Step 4: Simplify right side
   1,143.42x = 1,069,891.01
5. Step 5: Solve for x
   x = 1,069,891.01/1,143.42
6. Step 6: Final answer
   x = 935.69