Finding the Fourth Proportional to 2,588.58, 3,883.77 and 857.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,588.58 : 3,883.77 = 857.34 : x
2. Step 2: Convert to fraction form
   2,588.58/3,883.77 = 857.34/x
3. Step 3: Cross multiply
   2,588.58x = 3,883.77 × 857.34
4. Step 4: Simplify right side
   2,588.58x = 3,329,711.37
5. Step 5: Solve for x
   x = 3,329,711.37/2,588.58
6. Step 6: Final answer
   x = 1,286.31