Finding the Fourth Proportional to 2,091.49, 3,134.50 and 857.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,091.49 : 3,134.50 = 857.45 : x
2. Step 2: Convert to fraction form
   2,091.49/3,134.50 = 857.45/x
3. Step 3: Cross multiply
   2,091.49x = 3,134.50 × 857.45
4. Step 4: Simplify right side
   2,091.49x = 2,687,680.57
5. Step 5: Solve for x
   x = 2,687,680.57/2,091.49
6. Step 6: Final answer
   x = 1,285.06