Finding the Fourth Proportional to 2,114.66, 3,171.38 and 815.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,114.66 : 3,171.38 = 815.83 : x
2. Step 2: Convert to fraction form
   2,114.66/3,171.38 = 815.83/x
3. Step 3: Cross multiply
   2,114.66x = 3,171.38 × 815.83
4. Step 4: Simplify right side
   2,114.66x = 2,587,294.94
5. Step 5: Solve for x
   x = 2,587,294.94/2,114.66
6. Step 6: Final answer
   x = 1,223.50