Finding the Fourth Proportional to 1,342.27, 2,015.69 and 823.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,342.27 : 2,015.69 = 823.31 : x
2. Step 2: Convert to fraction form
   1,342.27/2,015.69 = 823.31/x
3. Step 3: Cross multiply
   1,342.27x = 2,015.69 × 823.31
4. Step 4: Simplify right side
   1,342.27x = 1,659,542.44
5. Step 5: Solve for x
   x = 1,659,542.44/1,342.27
6. Step 6: Final answer
   x = 1,236.37