Finding the Fourth Proportional to 1,191.93, 1,644.85 and 667.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,191.93 : 1,644.85 = 667.96 : x
2. Step 2: Convert to fraction form
   1,191.93/1,644.85 = 667.96/x
3. Step 3: Cross multiply
   1,191.93x = 1,644.85 × 667.96
4. Step 4: Simplify right side
   1,191.93x = 1,098,694.01
5. Step 5: Solve for x
   x = 1,098,694.01/1,191.93
6. Step 6: Final answer
   x = 921.78