Finding the Fourth Proportional to 2,667.79, 4,002.12 and 818.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,667.79 : 4,002.12 = 818.71 : x
2. Step 2: Convert to fraction form
   2,667.79/4,002.12 = 818.71/x
3. Step 3: Cross multiply
   2,667.79x = 4,002.12 × 818.71
4. Step 4: Simplify right side
   2,667.79x = 3,276,575.67
5. Step 5: Solve for x
   x = 3,276,575.67/2,667.79
6. Step 6: Final answer
   x = 1,228.20