Finding the Fourth Proportional to 1,443.78, 1,992.47 and 854.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.78 : 1,992.47 = 854.33 : x
2. Step 2: Convert to fraction form
   1,443.78/1,992.47 = 854.33/x
3. Step 3: Cross multiply
   1,443.78x = 1,992.47 × 854.33
4. Step 4: Simplify right side
   1,443.78x = 1,702,212.66
5. Step 5: Solve for x
   x = 1,702,212.66/1,443.78
6. Step 6: Final answer
   x = 1,179.00