Finding the Fourth Proportional to 2,142.12, 3,212.50 and 680.93

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.12 : 3,212.50 = 680.93 : x
2. Step 2: Convert to fraction form
   2,142.12/3,212.50 = 680.93/x
3. Step 3: Cross multiply
   2,142.12x = 3,212.50 × 680.93
4. Step 4: Simplify right side
   2,142.12x = 2,187,493.95
5. Step 5: Solve for x
   x = 2,187,493.95/2,142.12
6. Step 6: Final answer
   x = 1,021.18