Finding the Fourth Proportional to 2,123.18, 3,184.63 and 806.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.18 : 3,184.63 = 806.39 : x
2. Step 2: Convert to fraction form
   2,123.18/3,184.63 = 806.39/x
3. Step 3: Cross multiply
   2,123.18x = 3,184.63 × 806.39
4. Step 4: Simplify right side
   2,123.18x = 2,568,053.79
5. Step 5: Solve for x
   x = 2,568,053.79/2,123.18
6. Step 6: Final answer
   x = 1,209.53