Finding the Fourth Proportional to 2,131.07, 3,196.91 and 669.73

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.07 : 3,196.91 = 669.73 : x
2. Step 2: Convert to fraction form
   2,131.07/3,196.91 = 669.73/x
3. Step 3: Cross multiply
   2,131.07x = 3,196.91 × 669.73
4. Step 4: Simplify right side
   2,131.07x = 2,141,066.53
5. Step 5: Solve for x
   x = 2,141,066.53/2,131.07
6. Step 6: Final answer
   x = 1,004.69