Finding the Fourth Proportional to 2,131.57, 3,197.40 and 670.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.57 : 3,197.40 = 670.72 : x
2. Step 2: Convert to fraction form
   2,131.57/3,197.40 = 670.72/x
3. Step 3: Cross multiply
   2,131.57x = 3,197.40 × 670.72
4. Step 4: Simplify right side
   2,131.57x = 2,144,560.13
5. Step 5: Solve for x
   x = 2,144,560.13/2,131.57
6. Step 6: Final answer
   x = 1,006.09