Finding the Fourth Proportional to 1,443.79, 1,992.38 and 854.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.79 : 1,992.38 = 854.31 : x
2. Step 2: Convert to fraction form
   1,443.79/1,992.38 = 854.31/x
3. Step 3: Cross multiply
   1,443.79x = 1,992.38 × 854.31
4. Step 4: Simplify right side
   1,443.79x = 1,702,110.16
5. Step 5: Solve for x
   x = 1,702,110.16/1,443.79
6. Step 6: Final answer
   x = 1,178.92