Finding the Fourth Proportional to 1,789.30, 2,685.68 and 865.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,789.30 : 2,685.68 = 865.50 : x
2. Step 2: Convert to fraction form
   1,789.30/2,685.68 = 865.50/x
3. Step 3: Cross multiply
   1,789.30x = 2,685.68 × 865.50
4. Step 4: Simplify right side
   1,789.30x = 2,324,456.04
5. Step 5: Solve for x
   x = 2,324,456.04/1,789.30
6. Step 6: Final answer
   x = 1,299.09