Finding the Fourth Proportional to 2,016.57, 2,783.07 and 1,231.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,016.57 : 2,783.07 = 1,231.08 : x
2. Step 2: Convert to fraction form
   2,016.57/2,783.07 = 1,231.08/x
3. Step 3: Cross multiply
   2,016.57x = 2,783.07 × 1,231.08
4. Step 4: Simplify right side
   2,016.57x = 3,426,181.82
5. Step 5: Solve for x
   x = 3,426,181.82/2,016.57
6. Step 6: Final answer
   x = 1,699.01