Finding the Fourth Proportional to 1,423.92, 1,965.18 and 864.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,423.92 : 1,965.18 = 864.56 : x
2. Step 2: Convert to fraction form
   1,423.92/1,965.18 = 864.56/x
3. Step 3: Cross multiply
   1,423.92x = 1,965.18 × 864.56
4. Step 4: Simplify right side
   1,423.92x = 1,699,016.02
5. Step 5: Solve for x
   x = 1,699,016.02/1,423.92
6. Step 6: Final answer
   x = 1,193.20