Finding the Fourth Proportional to 1,015.31, 1,383.42 and 992.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.31 : 1,383.42 = 992.82 : x
2. Step 2: Convert to fraction form
   1,015.31/1,383.42 = 992.82/x
3. Step 3: Cross multiply
   1,015.31x = 1,383.42 × 992.82
4. Step 4: Simplify right side
   1,015.31x = 1,373,487.04
5. Step 5: Solve for x
   x = 1,373,487.04/1,015.31
6. Step 6: Final answer
   x = 1,352.78