Finding the Fourth Proportional to 2,128.45, 3,192.67 and 667.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.45 : 3,192.67 = 667.71 : x
2. Step 2: Convert to fraction form
   2,128.45/3,192.67 = 667.71/x
3. Step 3: Cross multiply
   2,128.45x = 3,192.67 × 667.71
4. Step 4: Simplify right side
   2,128.45x = 2,131,777.69
5. Step 5: Solve for x
   x = 2,131,777.69/2,128.45
6. Step 6: Final answer
   x = 1,001.56