Finding the Fourth Proportional to 1,279.54, 1,919.33 and 843.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,279.54 : 1,919.33 = 843.59 : x
2. Step 2: Convert to fraction form
   1,279.54/1,919.33 = 843.59/x
3. Step 3: Cross multiply
   1,279.54x = 1,919.33 × 843.59
4. Step 4: Simplify right side
   1,279.54x = 1,619,113.78
5. Step 5: Solve for x
   x = 1,619,113.78/1,279.54
6. Step 6: Final answer
   x = 1,265.39