Finding the Fourth Proportional to 2,087.82, 3,130.68 and 854.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.82 : 3,130.68 = 854.88 : x
2. Step 2: Convert to fraction form
   2,087.82/3,130.68 = 854.88/x
3. Step 3: Cross multiply
   2,087.82x = 3,130.68 × 854.88
4. Step 4: Simplify right side
   2,087.82x = 2,676,355.72
5. Step 5: Solve for x
   x = 2,676,355.72/2,087.82
6. Step 6: Final answer
   x = 1,281.89