Finding the Fourth Proportional to 1,443.28, 1,991.76 and 854.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.28 : 1,991.76 = 854.32 : x
2. Step 2: Convert to fraction form
   1,443.28/1,991.76 = 854.32/x
3. Step 3: Cross multiply
   1,443.28x = 1,991.76 × 854.32
4. Step 4: Simplify right side
   1,443.28x = 1,701,600.40
5. Step 5: Solve for x
   x = 1,701,600.40/1,443.28
6. Step 6: Final answer
   x = 1,178.98