Finding the Fourth Proportional to 1,227.33, 1,693.67 and 667.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,227.33 : 1,693.67 = 667.80 : x
2. Step 2: Convert to fraction form
   1,227.33/1,693.67 = 667.80/x
3. Step 3: Cross multiply
   1,227.33x = 1,693.67 × 667.80
4. Step 4: Simplify right side
   1,227.33x = 1,131,040.39
5. Step 5: Solve for x
   x = 1,131,040.39/1,227.33
6. Step 6: Final answer
   x = 921.54