Finding the Fourth Proportional to 1,145.98, 1,581.53 and 865.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.98 : 1,581.53 = 865.72 : x
2. Step 2: Convert to fraction form
   1,145.98/1,581.53 = 865.72/x
3. Step 3: Cross multiply
   1,145.98x = 1,581.53 × 865.72
4. Step 4: Simplify right side
   1,145.98x = 1,369,149.92
5. Step 5: Solve for x
   x = 1,369,149.92/1,145.98
6. Step 6: Final answer
   x = 1,194.75