Finding the Fourth Proportional to 1,443.90, 1,992.84 and 854.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.90 : 1,992.84 = 854.40 : x
2. Step 2: Convert to fraction form
   1,443.90/1,992.84 = 854.40/x
3. Step 3: Cross multiply
   1,443.90x = 1,992.84 × 854.40
4. Step 4: Simplify right side
   1,443.90x = 1,702,682.50
5. Step 5: Solve for x
   x = 1,702,682.50/1,443.90
6. Step 6: Final answer
   x = 1,179.22