Finding the Fourth Proportional to 1,443.60, 1,991.82 and 854.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.60 : 1,991.82 = 854.28 : x
2. Step 2: Convert to fraction form
   1,443.60/1,991.82 = 854.28/x
3. Step 3: Cross multiply
   1,443.60x = 1,991.82 × 854.28
4. Step 4: Simplify right side
   1,443.60x = 1,701,571.99
5. Step 5: Solve for x
   x = 1,701,571.99/1,443.60
6. Step 6: Final answer
   x = 1,178.70