Finding the Fourth Proportional to 2,015.51, 2,781.31 and 1,219.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.51 : 2,781.31 = 1,219.03 : x
2. Step 2: Convert to fraction form
   2,015.51/2,781.31 = 1,219.03/x
3. Step 3: Cross multiply
   2,015.51x = 2,781.31 × 1,219.03
4. Step 4: Simplify right side
   2,015.51x = 3,390,500.33
5. Step 5: Solve for x
   x = 3,390,500.33/2,015.51
6. Step 6: Final answer
   x = 1,682.20