Finding the Fourth Proportional to 2,120.82, 3,181.31 and 581.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,120.82 : 3,181.31 = 581.82 : x
2. Step 2: Convert to fraction form
   2,120.82/3,181.31 = 581.82/x
3. Step 3: Cross multiply
   2,120.82x = 3,181.31 × 581.82
4. Step 4: Simplify right side
   2,120.82x = 1,850,933.88
5. Step 5: Solve for x
   x = 1,850,933.88/2,120.82
6. Step 6: Final answer
   x = 872.75