Finding the Fourth Proportional to 1,018.58, 1,405.83 and 956.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.58 : 1,405.83 = 956.06 : x
2. Step 2: Convert to fraction form
   1,018.58/1,405.83 = 956.06/x
3. Step 3: Cross multiply
   1,018.58x = 1,405.83 × 956.06
4. Step 4: Simplify right side
   1,018.58x = 1,344,057.83
5. Step 5: Solve for x
   x = 1,344,057.83/1,018.58
6. Step 6: Final answer
   x = 1,319.54