Finding the Fourth Proportional to 1,191.50, 1,644.27 and 667.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,191.50 : 1,644.27 = 667.53 : x
2. Step 2: Convert to fraction form
   1,191.50/1,644.27 = 667.53/x
3. Step 3: Cross multiply
   1,191.50x = 1,644.27 × 667.53
4. Step 4: Simplify right side
   1,191.50x = 1,097,599.55
5. Step 5: Solve for x
   x = 1,097,599.55/1,191.50
6. Step 6: Final answer
   x = 921.19