Finding the Fourth Proportional to 1,528.74, 2,109.78 and 865.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.74 : 2,109.78 = 865.62 : x
2. Step 2: Convert to fraction form
   1,528.74/2,109.78 = 865.62/x
3. Step 3: Cross multiply
   1,528.74x = 2,109.78 × 865.62
4. Step 4: Simplify right side
   1,528.74x = 1,826,267.76
5. Step 5: Solve for x
   x = 1,826,267.76/1,528.74
6. Step 6: Final answer
   x = 1,194.62