Finding the Fourth Proportional to 2,131.47, 3,196.71 and 670.44

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.47 : 3,196.71 = 670.44 : x
2. Step 2: Convert to fraction form
   2,131.47/3,196.71 = 670.44/x
3. Step 3: Cross multiply
   2,131.47x = 3,196.71 × 670.44
4. Step 4: Simplify right side
   2,131.47x = 2,143,202.25
5. Step 5: Solve for x
   x = 2,143,202.25/2,131.47
6. Step 6: Final answer
   x = 1,005.50