Finding the Fourth Proportional to 1,191.48, 1,644.24 and 667.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,191.48 : 1,644.24 = 667.50 : x
2. Step 2: Convert to fraction form
   1,191.48/1,644.24 = 667.50/x
3. Step 3: Cross multiply
   1,191.48x = 1,644.24 × 667.50
4. Step 4: Simplify right side
   1,191.48x = 1,097,530.20
5. Step 5: Solve for x
   x = 1,097,530.20/1,191.48
6. Step 6: Final answer
   x = 921.15