Finding the Fourth Proportional to 2,288.78, 3,431.34 and 902.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,288.78 : 3,431.34 = 902.46 : x
2. Step 2: Convert to fraction form
   2,288.78/3,431.34 = 902.46/x
3. Step 3: Cross multiply
   2,288.78x = 3,431.34 × 902.46
4. Step 4: Simplify right side
   2,288.78x = 3,096,647.10
5. Step 5: Solve for x
   x = 3,096,647.10/2,288.78
6. Step 6: Final answer
   x = 1,352.97