Finding the Fourth Proportional to 1,227.51, 1,693.95 and 667.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,227.51 : 1,693.95 = 667.98 : x
2. Step 2: Convert to fraction form
   1,227.51/1,693.95 = 667.98/x
3. Step 3: Cross multiply
   1,227.51x = 1,693.95 × 667.98
4. Step 4: Simplify right side
   1,227.51x = 1,131,524.72
5. Step 5: Solve for x
   x = 1,131,524.72/1,227.51
6. Step 6: Final answer
   x = 921.80