Finding the Fourth Proportional to 1,227.48, 1,693.92 and 667.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,227.48 : 1,693.92 = 667.95 : x
2. Step 2: Convert to fraction form
   1,227.48/1,693.92 = 667.95/x
3. Step 3: Cross multiply
   1,227.48x = 1,693.92 × 667.95
4. Step 4: Simplify right side
   1,227.48x = 1,131,453.86
5. Step 5: Solve for x
   x = 1,131,453.86/1,227.48
6. Step 6: Final answer
   x = 921.77