Finding the Fourth Proportional to 1,403.46, 2,103.59 and 854.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403.46 : 2,103.59 = 854.43 : x
2. Step 2: Convert to fraction form
   1,403.46/2,103.59 = 854.43/x
3. Step 3: Cross multiply
   1,403.46x = 2,103.59 × 854.43
4. Step 4: Simplify right side
   1,403.46x = 1,797,372.54
5. Step 5: Solve for x
   x = 1,797,372.54/1,403.46
6. Step 6: Final answer
   x = 1,280.67