Finding the Fourth Proportional to 1,528.63, 2,109.56 and 865.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.63 : 2,109.56 = 865.59 : x
2. Step 2: Convert to fraction form
   1,528.63/2,109.56 = 865.59/x
3. Step 3: Cross multiply
   1,528.63x = 2,109.56 × 865.59
4. Step 4: Simplify right side
   1,528.63x = 1,826,014.04
5. Step 5: Solve for x
   x = 1,826,014.04/1,528.63
6. Step 6: Final answer
   x = 1,194.54