Finding the Fourth Proportional to 1,383.59, 1,909.08 and 859.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.59 : 1,909.08 = 859.38 : x
2. Step 2: Convert to fraction form
   1,383.59/1,909.08 = 859.38/x
3. Step 3: Cross multiply
   1,383.59x = 1,909.08 × 859.38
4. Step 4: Simplify right side
   1,383.59x = 1,640,625.17
5. Step 5: Solve for x
   x = 1,640,625.17/1,383.59
6. Step 6: Final answer
   x = 1,185.78