Finding the Fourth Proportional to 1,423.27, 1,964.25 and 863.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,423.27 : 1,964.25 = 863.61 : x
2. Step 2: Convert to fraction form
   1,423.27/1,964.25 = 863.61/x
3. Step 3: Cross multiply
   1,423.27x = 1,964.25 × 863.61
4. Step 4: Simplify right side
   1,423.27x = 1,696,349.63
5. Step 5: Solve for x
   x = 1,696,349.63/1,423.27
6. Step 6: Final answer
   x = 1,191.87