Finding the Fourth Proportional to 2,131.47, 3,196.75 and 670.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.47 : 3,196.75 = 670.28 : x
2. Step 2: Convert to fraction form
   2,131.47/3,196.75 = 670.28/x
3. Step 3: Cross multiply
   2,131.47x = 3,196.75 × 670.28
4. Step 4: Simplify right side
   2,131.47x = 2,142,717.59
5. Step 5: Solve for x
   x = 2,142,717.59/2,131.47
6. Step 6: Final answer
   x = 1,005.28