Finding the Fourth Proportional to 1,021.38, 1,410.94 and 910.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,021.38 : 1,410.94 = 910.82 : x
2. Step 2: Convert to fraction form
   1,021.38/1,410.94 = 910.82/x
3. Step 3: Cross multiply
   1,021.38x = 1,410.94 × 910.82
4. Step 4: Simplify right side
   1,021.38x = 1,285,112.37
5. Step 5: Solve for x
   x = 1,285,112.37/1,021.38
6. Step 6: Final answer
   x = 1,258.21