Finding the Fourth Proportional to 2,057.31, 3,086.78 and 902.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.31 : 3,086.78 = 902.25 : x
2. Step 2: Convert to fraction form
   2,057.31/3,086.78 = 902.25/x
3. Step 3: Cross multiply
   2,057.31x = 3,086.78 × 902.25
4. Step 4: Simplify right side
   2,057.31x = 2,785,042.74
5. Step 5: Solve for x
   x = 2,785,042.74/2,057.31
6. Step 6: Final answer
   x = 1,353.73