Finding the Fourth Proportional to 1,423.15, 1,962.57 and 863.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,423.15 : 1,962.57 = 863.71 : x
2. Step 2: Convert to fraction form
   1,423.15/1,962.57 = 863.71/x
3. Step 3: Cross multiply
   1,423.15x = 1,962.57 × 863.71
4. Step 4: Simplify right side
   1,423.15x = 1,695,091.33
5. Step 5: Solve for x
   x = 1,695,091.33/1,423.15
6. Step 6: Final answer
   x = 1,191.08