Finding the Fourth Proportional to 1,528.58, 2,109.37 and 865.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.58 : 2,109.37 = 865.53 : x
2. Step 2: Convert to fraction form
   1,528.58/2,109.37 = 865.53/x
3. Step 3: Cross multiply
   1,528.58x = 2,109.37 × 865.53
4. Step 4: Simplify right side
   1,528.58x = 1,825,723.02
5. Step 5: Solve for x
   x = 1,825,723.02/1,528.58
6. Step 6: Final answer
   x = 1,194.39