Finding the Fourth Proportional to 2,317.83, 3,478.32 and 857.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,317.83 : 3,478.32 = 857.04 : x
2. Step 2: Convert to fraction form
   2,317.83/3,478.32 = 857.04/x
3. Step 3: Cross multiply
   2,317.83x = 3,478.32 × 857.04
4. Step 4: Simplify right side
   2,317.83x = 2,981,059.37
5. Step 5: Solve for x
   x = 2,981,059.37/2,317.83
6. Step 6: Final answer
   x = 1,286.14