Finding the Fourth Proportional to 1,066.80, 1,600.72 and 450.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,066.80 : 1,600.72 = 450.72 : x
2. Step 2: Convert to fraction form
   1,066.80/1,600.72 = 450.72/x
3. Step 3: Cross multiply
   1,066.80x = 1,600.72 × 450.72
4. Step 4: Simplify right side
   1,066.80x = 721,476.52
5. Step 5: Solve for x
   x = 721,476.52/1,066.80
6. Step 6: Final answer
   x = 676.30