Finding the Fourth Proportional to 2,009.50, 3,015.47 and 855.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,009.50 : 3,015.47 = 855.25 : x
2. Step 2: Convert to fraction form
   2,009.50/3,015.47 = 855.25/x
3. Step 3: Cross multiply
   2,009.50x = 3,015.47 × 855.25
4. Step 4: Simplify right side
   2,009.50x = 2,578,980.72
5. Step 5: Solve for x
   x = 2,578,980.72/2,009.50
6. Step 6: Final answer
   x = 1,283.39