Finding the Fourth Proportional to 1,511.94, 2,086.49 and 839.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,511.94 : 2,086.49 = 839.76 : x
2. Step 2: Convert to fraction form
   1,511.94/2,086.49 = 839.76/x
3. Step 3: Cross multiply
   1,511.94x = 2,086.49 × 839.76
4. Step 4: Simplify right side
   1,511.94x = 1,752,150.84
5. Step 5: Solve for x
   x = 1,752,150.84/1,511.94
6. Step 6: Final answer
   x = 1,158.88