Finding the Fourth Proportional to 2,100.87, 3,151.22 and 851.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.87 : 3,151.22 = 851.42 : x
2. Step 2: Convert to fraction form
   2,100.87/3,151.22 = 851.42/x
3. Step 3: Cross multiply
   2,100.87x = 3,151.22 × 851.42
4. Step 4: Simplify right side
   2,100.87x = 2,682,995.98
5. Step 5: Solve for x
   x = 2,682,995.98/2,100.87
6. Step 6: Final answer
   x = 1,277.09