Finding the Fourth Proportional to 2,128.69, 3,193.20 and 667.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.69 : 3,193.20 = 667.84 : x
2. Step 2: Convert to fraction form
   2,128.69/3,193.20 = 667.84/x
3. Step 3: Cross multiply
   2,128.69x = 3,193.20 × 667.84
4. Step 4: Simplify right side
   2,128.69x = 2,132,546.69
5. Step 5: Solve for x
   x = 2,132,546.69/2,128.69
6. Step 6: Final answer
   x = 1,001.81