Finding the Fourth Proportional to 1,118.83, 1,544.42 and 839.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,118.83 : 1,544.42 = 839.87 : x
2. Step 2: Convert to fraction form
   1,118.83/1,544.42 = 839.87/x
3. Step 3: Cross multiply
   1,118.83x = 1,544.42 × 839.87
4. Step 4: Simplify right side
   1,118.83x = 1,297,112.03
5. Step 5: Solve for x
   x = 1,297,112.03/1,118.83
6. Step 6: Final answer
   x = 1,159.35