Finding the Fourth Proportional to 2,789.52, 4,181.56 and 1,328.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,789.52 : 4,181.56 = 1,328.28 : x
2. Step 2: Convert to fraction form
   2,789.52/4,181.56 = 1,328.28/x
3. Step 3: Cross multiply
   2,789.52x = 4,181.56 × 1,328.28
4. Step 4: Simplify right side
   2,789.52x = 5,554,282.52
5. Step 5: Solve for x
   x = 5,554,282.52/2,789.52
6. Step 6: Final answer
   x = 1,991.12