Finding the Fourth Proportional to 1,003.05, 1,382.05 and 935.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.05 : 1,382.05 = 935.31 : x
2. Step 2: Convert to fraction form
   1,003.05/1,382.05 = 935.31/x
3. Step 3: Cross multiply
   1,003.05x = 1,382.05 × 935.31
4. Step 4: Simplify right side
   1,003.05x = 1,292,645.19
5. Step 5: Solve for x
   x = 1,292,645.19/1,003.05
6. Step 6: Final answer
   x = 1,288.71