Finding the Fourth Proportional to 955.92, 1,322.78 and 815.82

Step by Step Solution

1. Step 1: Write the proportion equation
   955.92 : 1,322.78 = 815.82 : x
2. Step 2: Convert to fraction form
   955.92/1,322.78 = 815.82/x
3. Step 3: Cross multiply
   955.92x = 1,322.78 × 815.82
4. Step 4: Simplify right side
   955.92x = 1,079,150.38
5. Step 5: Solve for x
   x = 1,079,150.38/955.92
6. Step 6: Final answer
   x = 1,128.91