Finding the Fourth Proportional to 2,667.55, 4,001.97 and 818.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,667.55 : 4,001.97 = 818.56 : x
2. Step 2: Convert to fraction form
   2,667.55/4,001.97 = 818.56/x
3. Step 3: Cross multiply
   2,667.55x = 4,001.97 × 818.56
4. Step 4: Simplify right side
   2,667.55x = 3,275,852.56
5. Step 5: Solve for x
   x = 3,275,852.56/2,667.55
6. Step 6: Final answer
   x = 1,228.04