Finding the Fourth Proportional to 1,528.73, 2,109.57 and 865.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.73 : 2,109.57 = 865.59 : x
2. Step 2: Convert to fraction form
   1,528.73/2,109.57 = 865.59/x
3. Step 3: Cross multiply
   1,528.73x = 2,109.57 × 865.59
4. Step 4: Simplify right side
   1,528.73x = 1,826,011.54
5. Step 5: Solve for x
   x = 1,826,011.54/1,528.73
6. Step 6: Final answer
   x = 1,194.46