Finding the Fourth Proportional to 1,404.28, 2,107.71 and 711.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.28 : 2,107.71 = 711.43 : x
2. Step 2: Convert to fraction form
   1,404.28/2,107.71 = 711.43/x
3. Step 3: Cross multiply
   1,404.28x = 2,107.71 × 711.43
4. Step 4: Simplify right side
   1,404.28x = 1,499,481.97
5. Step 5: Solve for x
   x = 1,499,481.97/1,404.28
6. Step 6: Final answer
   x = 1,067.80