Finding the Fourth Proportional to 1,404.72, 2,107.31 and 674.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.72 : 2,107.31 = 674.28 : x
2. Step 2: Convert to fraction form
   1,404.72/2,107.31 = 674.28/x
3. Step 3: Cross multiply
   1,404.72x = 2,107.31 × 674.28
4. Step 4: Simplify right side
   1,404.72x = 1,420,913.62
5. Step 5: Solve for x
   x = 1,420,913.62/1,404.72
6. Step 6: Final answer
   x = 1,011.53