Finding the Fourth Proportional to 2,667.69, 4,002.08 and 818.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,667.69 : 4,002.08 = 818.91 : x
2. Step 2: Convert to fraction form
   2,667.69/4,002.08 = 818.91/x
3. Step 3: Cross multiply
   2,667.69x = 4,002.08 × 818.91
4. Step 4: Simplify right side
   2,667.69x = 3,277,339.24
5. Step 5: Solve for x
   x = 3,277,339.24/2,667.69
6. Step 6: Final answer
   x = 1,228.53