Finding the Fourth Proportional to 2,018.79, 2,789.45 and 1,668.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,018.79 : 2,789.45 = 1,668.87 : x
2. Step 2: Convert to fraction form
   2,018.79/2,789.45 = 1,668.87/x
3. Step 3: Cross multiply
   2,018.79x = 2,789.45 × 1,668.87
4. Step 4: Simplify right side
   2,018.79x = 4,655,229.42
5. Step 5: Solve for x
   x = 4,655,229.42/2,018.79
6. Step 6: Final answer
   x = 2,305.95