Finding the Fourth Proportional to 2,146.89, 3,221.78 and 992.73

Step by Step Solution

1. Step 1: Write the proportion equation
   2,146.89 : 3,221.78 = 992.73 : x
2. Step 2: Convert to fraction form
   2,146.89/3,221.78 = 992.73/x
3. Step 3: Cross multiply
   2,146.89x = 3,221.78 × 992.73
4. Step 4: Simplify right side
   2,146.89x = 3,198,352.70
5. Step 5: Solve for x
   x = 3,198,352.70/2,146.89
6. Step 6: Final answer
   x = 1,489.76