Finding the Fourth Proportional to 1,145.69, 1,579.89 and 935.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.69 : 1,579.89 = 935.19 : x
2. Step 2: Convert to fraction form
   1,145.69/1,579.89 = 935.19/x
3. Step 3: Cross multiply
   1,145.69x = 1,579.89 × 935.19
4. Step 4: Simplify right side
   1,145.69x = 1,477,497.33
5. Step 5: Solve for x
   x = 1,477,497.33/1,145.69
6. Step 6: Final answer
   x = 1,289.61