Finding the Fourth Proportional to 2,287.07, 3,428.56 and 825.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,287.07 : 3,428.56 = 825.89 : x
2. Step 2: Convert to fraction form
   2,287.07/3,428.56 = 825.89/x
3. Step 3: Cross multiply
   2,287.07x = 3,428.56 × 825.89
4. Step 4: Simplify right side
   2,287.07x = 2,831,609.29
5. Step 5: Solve for x
   x = 2,831,609.29/2,287.07
6. Step 6: Final answer
   x = 1,238.10