Finding the Fourth Proportional to 2,288.17, 3,431.76 and 826.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,288.17 : 3,431.76 = 826.51 : x
2. Step 2: Convert to fraction form
   2,288.17/3,431.76 = 826.51/x
3. Step 3: Cross multiply
   2,288.17x = 3,431.76 × 826.51
4. Step 4: Simplify right side
   2,288.17x = 2,836,383.96
5. Step 5: Solve for x
   x = 2,836,383.96/2,288.17
6. Step 6: Final answer
   x = 1,239.59