Finding the Fourth Proportional to 1,128.83, 1,690.14 and 964.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.83 : 1,690.14 = 964.27 : x
2. Step 2: Convert to fraction form
   1,128.83/1,690.14 = 964.27/x
3. Step 3: Cross multiply
   1,128.83x = 1,690.14 × 964.27
4. Step 4: Simplify right side
   1,128.83x = 1,629,742.85
5. Step 5: Solve for x
   x = 1,629,742.85/1,128.83
6. Step 6: Final answer
   x = 1,443.75