Finding the Fourth Proportional to 1,443.77, 1,991.61 and 854.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.77 : 1,991.61 = 854.19 : x
2. Step 2: Convert to fraction form
   1,443.77/1,991.61 = 854.19/x
3. Step 3: Cross multiply
   1,443.77x = 1,991.61 × 854.19
4. Step 4: Simplify right side
   1,443.77x = 1,701,213.35
5. Step 5: Solve for x
   x = 1,701,213.35/1,443.77
6. Step 6: Final answer
   x = 1,178.31