Finding the Fourth Proportional to 1,016.91, 1,393.72 and 1,003.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.91 : 1,393.72 = 1,003.95 : x
2. Step 2: Convert to fraction form
   1,016.91/1,393.72 = 1,003.95/x
3. Step 3: Cross multiply
   1,016.91x = 1,393.72 × 1,003.95
4. Step 4: Simplify right side
   1,016.91x = 1,399,222.68
5. Step 5: Solve for x
   x = 1,399,222.68/1,016.91
6. Step 6: Final answer
   x = 1,375.96