Finding the Fourth Proportional to 1,868.31, 2,578.15 and 1,082.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,868.31 : 2,578.15 = 1,082.20 : x
2. Step 2: Convert to fraction form
   1,868.31/2,578.15 = 1,082.20/x
3. Step 3: Cross multiply
   1,868.31x = 2,578.15 × 1,082.20
4. Step 4: Simplify right side
   1,868.31x = 2,790,068.52
5. Step 5: Solve for x
   x = 2,790,068.52/1,868.31
6. Step 6: Final answer
   x = 1,493.37