Finding the Fourth Proportional to 2,128.38, 3,192.39 and 667.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.38 : 3,192.39 = 667.50 : x
2. Step 2: Convert to fraction form
   2,128.38/3,192.39 = 667.50/x
3. Step 3: Cross multiply
   2,128.38x = 3,192.39 × 667.50
4. Step 4: Simplify right side
   2,128.38x = 2,130,920.33
5. Step 5: Solve for x
   x = 2,130,920.33/2,128.38
6. Step 6: Final answer
   x = 1,001.19