Finding the Fourth Proportional to 1,423.95, 1,964.96 and 818.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,423.95 : 1,964.96 = 818.31 : x
2. Step 2: Convert to fraction form
   1,423.95/1,964.96 = 818.31/x
3. Step 3: Cross multiply
   1,423.95x = 1,964.96 × 818.31
4. Step 4: Simplify right side
   1,423.95x = 1,607,942.33
5. Step 5: Solve for x
   x = 1,607,942.33/1,423.95
6. Step 6: Final answer
   x = 1,129.21