Finding the Fourth Proportional to 2,091.51, 3,134.88 and 857.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,091.51 : 3,134.88 = 857.34 : x
2. Step 2: Convert to fraction form
   2,091.51/3,134.88 = 857.34/x
3. Step 3: Cross multiply
   2,091.51x = 3,134.88 × 857.34
4. Step 4: Simplify right side
   2,091.51x = 2,687,658.02
5. Step 5: Solve for x
   x = 2,687,658.02/2,091.51
6. Step 6: Final answer
   x = 1,285.03