Finding the Fourth Proportional to 1,528.58, 2,109.81 and 865.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.58 : 2,109.81 = 865.82 : x
2. Step 2: Convert to fraction form
   1,528.58/2,109.81 = 865.82/x
3. Step 3: Cross multiply
   1,528.58x = 2,109.81 × 865.82
4. Step 4: Simplify right side
   1,528.58x = 1,826,724.22
5. Step 5: Solve for x
   x = 1,826,724.22/1,528.58
6. Step 6: Final answer
   x = 1,195.05