Finding the Fourth Proportional to 1,066.72, 1,597.16 and 720.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,066.72 : 1,597.16 = 720.64 : x
2. Step 2: Convert to fraction form
   1,066.72/1,597.16 = 720.64/x
3. Step 3: Cross multiply
   1,066.72x = 1,597.16 × 720.64
4. Step 4: Simplify right side
   1,066.72x = 1,150,977.38
5. Step 5: Solve for x
   x = 1,150,977.38/1,066.72
6. Step 6: Final answer
   x = 1,078.99