Finding the Fourth Proportional to 2,287.02, 3,428.37 and 825.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,287.02 : 3,428.37 = 825.78 : x
2. Step 2: Convert to fraction form
   2,287.02/3,428.37 = 825.78/x
3. Step 3: Cross multiply
   2,287.02x = 3,428.37 × 825.78
4. Step 4: Simplify right side
   2,287.02x = 2,831,079.38
5. Step 5: Solve for x
   x = 2,831,079.38/2,287.02
6. Step 6: Final answer
   x = 1,237.89