Finding the Fourth Proportional to 1,227.43, 1,693.83 and 667.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,227.43 : 1,693.83 = 667.90 : x
2. Step 2: Convert to fraction form
   1,227.43/1,693.83 = 667.90/x
3. Step 3: Cross multiply
   1,227.43x = 1,693.83 × 667.90
4. Step 4: Simplify right side
   1,227.43x = 1,131,309.06
5. Step 5: Solve for x
   x = 1,131,309.06/1,227.43
6. Step 6: Final answer
   x = 921.69