Finding the Fourth Proportional to 1,528.83, 2,109.71 and 865.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.83 : 2,109.71 = 865.78 : x
2. Step 2: Convert to fraction form
   1,528.83/2,109.71 = 865.78/x
3. Step 3: Cross multiply
   1,528.83x = 2,109.71 × 865.78
4. Step 4: Simplify right side
   1,528.83x = 1,826,541.61
5. Step 5: Solve for x
   x = 1,826,541.61/1,528.83
6. Step 6: Final answer
   x = 1,194.73