Finding the Fourth Proportional to 2,612.34, 3,918.73 and 857.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,612.34 : 3,918.73 = 857.33 : x
2. Step 2: Convert to fraction form
   2,612.34/3,918.73 = 857.33/x
3. Step 3: Cross multiply
   2,612.34x = 3,918.73 × 857.33
4. Step 4: Simplify right side
   2,612.34x = 3,359,644.79
5. Step 5: Solve for x
   x = 3,359,644.79/2,612.34
6. Step 6: Final answer
   x = 1,286.07