Finding the Fourth Proportional to 1,279.43, 1,764.59 and 859.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,279.43 : 1,764.59 = 859.49 : x
2. Step 2: Convert to fraction form
   1,279.43/1,764.59 = 859.49/x
3. Step 3: Cross multiply
   1,279.43x = 1,764.59 × 859.49
4. Step 4: Simplify right side
   1,279.43x = 1,516,650.88
5. Step 5: Solve for x
   x = 1,516,650.88/1,279.43
6. Step 6: Final answer
   x = 1,185.41