Finding the Fourth Proportional to 1,227.42, 1,693.85 and 667.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,227.42 : 1,693.85 = 667.87 : x
2. Step 2: Convert to fraction form
   1,227.42/1,693.85 = 667.87/x
3. Step 3: Cross multiply
   1,227.42x = 1,693.85 × 667.87
4. Step 4: Simplify right side
   1,227.42x = 1,131,264.03
5. Step 5: Solve for x
   x = 1,131,264.03/1,227.42
6. Step 6: Final answer
   x = 921.66