Finding the Fourth Proportional to 1,066.38, 1,601.15 and 921.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,066.38 : 1,601.15 = 921.27 : x
2. Step 2: Convert to fraction form
   1,066.38/1,601.15 = 921.27/x
3. Step 3: Cross multiply
   1,066.38x = 1,601.15 × 921.27
4. Step 4: Simplify right side
   1,066.38x = 1,475,086.85
5. Step 5: Solve for x
   x = 1,475,086.85/1,066.38
6. Step 6: Final answer
   x = 1,383.27