Finding the Fourth Proportional to 1,066.72, 1,601.61 and 885.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,066.72 : 1,601.61 = 885.28 : x
2. Step 2: Convert to fraction form
   1,066.72/1,601.61 = 885.28/x
3. Step 3: Cross multiply
   1,066.72x = 1,601.61 × 885.28
4. Step 4: Simplify right side
   1,066.72x = 1,417,873.30
5. Step 5: Solve for x
   x = 1,417,873.30/1,066.72
6. Step 6: Final answer
   x = 1,329.19