Finding the Fourth Proportional to 1,868.76, 2,578.46 and 1,082.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,868.76 : 2,578.46 = 1,082.78 : x
2. Step 2: Convert to fraction form
   1,868.76/2,578.46 = 1,082.78/x
3. Step 3: Cross multiply
   1,868.76x = 2,578.46 × 1,082.78
4. Step 4: Simplify right side
   1,868.76x = 2,791,904.92
5. Step 5: Solve for x
   x = 2,791,904.92/1,868.76
6. Step 6: Final answer
   x = 1,493.99