Finding the Fourth Proportional to 1,132.72, 1,563.32 and 667.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,132.72 : 1,563.32 = 667.12 : x
2. Step 2: Convert to fraction form
   1,132.72/1,563.32 = 667.12/x
3. Step 3: Cross multiply
   1,132.72x = 1,563.32 × 667.12
4. Step 4: Simplify right side
   1,132.72x = 1,042,922.04
5. Step 5: Solve for x
   x = 1,042,922.04/1,132.72
6. Step 6: Final answer
   x = 920.72