Finding the Fourth Proportional to 3,454.59, 5,181.71 and 857.37

Step by Step Solution

1. Step 1: Write the proportion equation
   3,454.59 : 5,181.71 = 857.37 : x
2. Step 2: Convert to fraction form
   3,454.59/5,181.71 = 857.37/x
3. Step 3: Cross multiply
   3,454.59x = 5,181.71 × 857.37
4. Step 4: Simplify right side
   3,454.59x = 4,442,638.42
5. Step 5: Solve for x
   x = 4,442,638.42/3,454.59
6. Step 6: Final answer
   x = 1,286.01