Finding the Fourth Proportional to 1,191.88, 1,644.86 and 667.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,191.88 : 1,644.86 = 667.96 : x
2. Step 2: Convert to fraction form
   1,191.88/1,644.86 = 667.96/x
3. Step 3: Cross multiply
   1,191.88x = 1,644.86 × 667.96
4. Step 4: Simplify right side
   1,191.88x = 1,098,700.69
5. Step 5: Solve for x
   x = 1,098,700.69/1,191.88
6. Step 6: Final answer
   x = 921.82