Finding the Fourth Proportional to 2,156.85, 3,231.03 and 1,229.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.85 : 3,231.03 = 1,229.61 : x
2. Step 2: Convert to fraction form
   2,156.85/3,231.03 = 1,229.61/x
3. Step 3: Cross multiply
   2,156.85x = 3,231.03 × 1,229.61
4. Step 4: Simplify right side
   2,156.85x = 3,972,906.80
5. Step 5: Solve for x
   x = 3,972,906.80/2,156.85
6. Step 6: Final answer
   x = 1,841.99