Finding the Fourth Proportional to 1,057.41, 1,591.63 and 956.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.41 : 1,591.63 = 956.79 : x
2. Step 2: Convert to fraction form
   1,057.41/1,591.63 = 956.79/x
3. Step 3: Cross multiply
   1,057.41x = 1,591.63 × 956.79
4. Step 4: Simplify right side
   1,057.41x = 1,522,853.28
5. Step 5: Solve for x
   x = 1,522,853.28/1,057.41
6. Step 6: Final answer
   x = 1,440.17