Finding the Fourth Proportional to 2,015.02, 2,780.87 and 1,218.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.02 : 2,780.87 = 1,218.54 : x
2. Step 2: Convert to fraction form
   2,015.02/2,780.87 = 1,218.54/x
3. Step 3: Cross multiply
   2,015.02x = 2,780.87 × 1,218.54
4. Step 4: Simplify right side
   2,015.02x = 3,388,601.33
5. Step 5: Solve for x
   x = 3,388,601.33/2,015.02
6. Step 6: Final answer
   x = 1,681.67