Finding the Fourth Proportional to 2,008.78, 3,013.56 and 854.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,008.78 : 3,013.56 = 854.50 : x
2. Step 2: Convert to fraction form
   2,008.78/3,013.56 = 854.50/x
3. Step 3: Cross multiply
   2,008.78x = 3,013.56 × 854.50
4. Step 4: Simplify right side
   2,008.78x = 2,575,087.02
5. Step 5: Solve for x
   x = 2,575,087.02/2,008.78
6. Step 6: Final answer
   x = 1,281.92