Finding the Fourth Proportional to 1,227.31, 1,693.71 and 667.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,227.31 : 1,693.71 = 667.79 : x
2. Step 2: Convert to fraction form
   1,227.31/1,693.71 = 667.79/x
3. Step 3: Cross multiply
   1,227.31x = 1,693.71 × 667.79
4. Step 4: Simplify right side
   1,227.31x = 1,131,039.26
5. Step 5: Solve for x
   x = 1,131,039.26/1,227.31
6. Step 6: Final answer
   x = 921.56