Finding the Fourth Proportional to 2,087.31, 3,130.52 and 854.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.31 : 3,130.52 = 854.40 : x
2. Step 2: Convert to fraction form
   2,087.31/3,130.52 = 854.40/x
3. Step 3: Cross multiply
   2,087.31x = 3,130.52 × 854.40
4. Step 4: Simplify right side
   2,087.31x = 2,674,712.02
5. Step 5: Solve for x
   x = 2,674,712.02/2,087.31
6. Step 6: Final answer
   x = 1,281.42