Finding the Fourth Proportional to 1,528.71, 2,109.27 and 865.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.71 : 2,109.27 = 865.47 : x
2. Step 2: Convert to fraction form
   1,528.71/2,109.27 = 865.47/x
3. Step 3: Cross multiply
   1,528.71x = 2,109.27 × 865.47
4. Step 4: Simplify right side
   1,528.71x = 1,825,509.91
5. Step 5: Solve for x
   x = 1,825,509.91/1,528.71
6. Step 6: Final answer
   x = 1,194.15