Finding the Fourth Proportional to 1,511.75, 2,086.16 and 839.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,511.75 : 2,086.16 = 839.59 : x
2. Step 2: Convert to fraction form
   1,511.75/2,086.16 = 839.59/x
3. Step 3: Cross multiply
   1,511.75x = 2,086.16 × 839.59
4. Step 4: Simplify right side
   1,511.75x = 1,751,519.62
5. Step 5: Solve for x
   x = 1,751,519.62/1,511.75
6. Step 6: Final answer
   x = 1,158.60