Finding the Fourth Proportional to 1,443.56, 1,991.82 and 854.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.56 : 1,991.82 = 854.18 : x
2. Step 2: Convert to fraction form
   1,443.56/1,991.82 = 854.18/x
3. Step 3: Cross multiply
   1,443.56x = 1,991.82 × 854.18
4. Step 4: Simplify right side
   1,443.56x = 1,701,372.81
5. Step 5: Solve for x
   x = 1,701,372.81/1,443.56
6. Step 6: Final answer
   x = 1,178.60