Finding the Fourth Proportional to 2,086.55, 3,130.65 and 854.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.55 : 3,130.65 = 854.81 : x
2. Step 2: Convert to fraction form
   2,086.55/3,130.65 = 854.81/x
3. Step 3: Cross multiply
   2,086.55x = 3,130.65 × 854.81
4. Step 4: Simplify right side
   2,086.55x = 2,676,095.27
5. Step 5: Solve for x
   x = 2,676,095.27/2,086.55
6. Step 6: Final answer
   x = 1,282.55