Finding the Fourth Proportional to 2,009.82, 3,015.59 and 840.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,009.82 : 3,015.59 = 840.09 : x
2. Step 2: Convert to fraction form
   2,009.82/3,015.59 = 840.09/x
3. Step 3: Cross multiply
   2,009.82x = 3,015.59 × 840.09
4. Step 4: Simplify right side
   2,009.82x = 2,533,362.80
5. Step 5: Solve for x
   x = 2,533,362.80/2,009.82
6. Step 6: Final answer
   x = 1,260.49