Finding the Fourth Proportional to 2,230.62, 3,078.31 and 1,222.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,230.62 : 3,078.31 = 1,222.43 : x
2. Step 2: Convert to fraction form
   2,230.62/3,078.31 = 1,222.43/x
3. Step 3: Cross multiply
   2,230.62x = 3,078.31 × 1,222.43
4. Step 4: Simplify right side
   2,230.62x = 3,763,002.34
5. Step 5: Solve for x
   x = 3,763,002.34/2,230.62
6. Step 6: Final answer
   x = 1,686.97