Finding the Fourth Proportional to 1,399.54, 1,932.36 and 928.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.54 : 1,932.36 = 928.42 : x
2. Step 2: Convert to fraction form
   1,399.54/1,932.36 = 928.42/x
3. Step 3: Cross multiply
   1,399.54x = 1,932.36 × 928.42
4. Step 4: Simplify right side
   1,399.54x = 1,794,033.22
5. Step 5: Solve for x
   x = 1,794,033.22/1,399.54
6. Step 6: Final answer
   x = 1,281.87