Finding the Fourth Proportional to 1,528.84, 2,109.77 and 865.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.84 : 2,109.77 = 865.72 : x
2. Step 2: Convert to fraction form
   1,528.84/2,109.77 = 865.72/x
3. Step 3: Cross multiply
   1,528.84x = 2,109.77 × 865.72
4. Step 4: Simplify right side
   1,528.84x = 1,826,465.76
5. Step 5: Solve for x
   x = 1,826,465.76/1,528.84
6. Step 6: Final answer
   x = 1,194.67