Finding the Fourth Proportional to 1,078.50, 1,485.34 and 1,022.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.50 : 1,485.34 = 1,022.88 : x
2. Step 2: Convert to fraction form
   1,078.50/1,485.34 = 1,022.88/x
3. Step 3: Cross multiply
   1,078.50x = 1,485.34 × 1,022.88
4. Step 4: Simplify right side
   1,078.50x = 1,519,324.58
5. Step 5: Solve for x
   x = 1,519,324.58/1,078.50
6. Step 6: Final answer
   x = 1,408.74