Finding the Fourth Proportional to 1,424.85, 1,965.72 and 865.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,424.85 : 1,965.72 = 865.11 : x
2. Step 2: Convert to fraction form
   1,424.85/1,965.72 = 865.11/x
3. Step 3: Cross multiply
   1,424.85x = 1,965.72 × 865.11
4. Step 4: Simplify right side
   1,424.85x = 1,700,564.03
5. Step 5: Solve for x
   x = 1,700,564.03/1,424.85
6. Step 6: Final answer
   x = 1,193.50