Finding the Fourth Proportional to 1,424.67, 1,966.05 and 857.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,424.67 : 1,966.05 = 857.42 : x
2. Step 2: Convert to fraction form
   1,424.67/1,966.05 = 857.42/x
3. Step 3: Cross multiply
   1,424.67x = 1,966.05 × 857.42
4. Step 4: Simplify right side
   1,424.67x = 1,685,730.59
5. Step 5: Solve for x
   x = 1,685,730.59/1,424.67
6. Step 6: Final answer
   x = 1,183.24