Finding the Fourth Proportional to 1,171.94, 1,617.06 and 667.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,171.94 : 1,617.06 = 667.79 : x
2. Step 2: Convert to fraction form
   1,171.94/1,617.06 = 667.79/x
3. Step 3: Cross multiply
   1,171.94x = 1,617.06 × 667.79
4. Step 4: Simplify right side
   1,171.94x = 1,079,848.41
5. Step 5: Solve for x
   x = 1,079,848.41/1,171.94
6. Step 6: Final answer
   x = 921.42