Finding the Fourth Proportional to 1,078.30, 1,487.57 and 889.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.30 : 1,487.57 = 889.37 : x
2. Step 2: Convert to fraction form
   1,078.30/1,487.57 = 889.37/x
3. Step 3: Cross multiply
   1,078.30x = 1,487.57 × 889.37
4. Step 4: Simplify right side
   1,078.30x = 1,322,993.82
5. Step 5: Solve for x
   x = 1,322,993.82/1,078.30
6. Step 6: Final answer
   x = 1,226.92