Finding the Fourth Proportional to 2,016.61, 2,783.06 and 1,230.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,016.61 : 2,783.06 = 1,230.79 : x
2. Step 2: Convert to fraction form
   2,016.61/2,783.06 = 1,230.79/x
3. Step 3: Cross multiply
   2,016.61x = 2,783.06 × 1,230.79
4. Step 4: Simplify right side
   2,016.61x = 3,425,362.42
5. Step 5: Solve for x
   x = 3,425,362.42/2,016.61
6. Step 6: Final answer
   x = 1,698.57