Finding the Fourth Proportional to 1,868.78, 2,578.77 and 1,082.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,868.78 : 2,578.77 = 1,082.88 : x
2. Step 2: Convert to fraction form
   1,868.78/2,578.77 = 1,082.88/x
3. Step 3: Cross multiply
   1,868.78x = 2,578.77 × 1,082.88
4. Step 4: Simplify right side
   1,868.78x = 2,792,498.46
5. Step 5: Solve for x
   x = 2,792,498.46/1,868.78
6. Step 6: Final answer
   x = 1,494.29