Finding the Fourth Proportional to 1,528.59, 2,109.54 and 865.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.59 : 2,109.54 = 865.51 : x
2. Step 2: Convert to fraction form
   1,528.59/2,109.54 = 865.51/x
3. Step 3: Cross multiply
   1,528.59x = 2,109.54 × 865.51
4. Step 4: Simplify right side
   1,528.59x = 1,825,825.94
5. Step 5: Solve for x
   x = 1,825,825.94/1,528.59
6. Step 6: Final answer
   x = 1,194.45