Finding the Fourth Proportional to 1,528.85, 2,109.89 and 865.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.85 : 2,109.89 = 865.69 : x
2. Step 2: Convert to fraction form
   1,528.85/2,109.89 = 865.69/x
3. Step 3: Cross multiply
   1,528.85x = 2,109.89 × 865.69
4. Step 4: Simplify right side
   1,528.85x = 1,826,501.48
5. Step 5: Solve for x
   x = 1,826,501.48/1,528.85
6. Step 6: Final answer
   x = 1,194.69