Finding the Fourth Proportional to 2,141.67, 3,212.60 and 680.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,141.67 : 3,212.60 = 680.79 : x
2. Step 2: Convert to fraction form
   2,141.67/3,212.60 = 680.79/x
3. Step 3: Cross multiply
   2,141.67x = 3,212.60 × 680.79
4. Step 4: Simplify right side
   2,141.67x = 2,187,105.95
5. Step 5: Solve for x
   x = 2,187,105.95/2,141.67
6. Step 6: Final answer
   x = 1,021.22