Finding the Fourth Proportional to 2,131.94, 3,198.31 and 670.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.94 : 3,198.31 = 670.70 : x
2. Step 2: Convert to fraction form
   2,131.94/3,198.31 = 670.70/x
3. Step 3: Cross multiply
   2,131.94x = 3,198.31 × 670.70
4. Step 4: Simplify right side
   2,131.94x = 2,145,106.52
5. Step 5: Solve for x
   x = 2,145,106.52/2,131.94
6. Step 6: Final answer
   x = 1,006.18