Finding the Fourth Proportional to 1,308.86, 1,804.36 and 935.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.86 : 1,804.36 = 935.71 : x
2. Step 2: Convert to fraction form
   1,308.86/1,804.36 = 935.71/x
3. Step 3: Cross multiply
   1,308.86x = 1,804.36 × 935.71
4. Step 4: Simplify right side
   1,308.86x = 1,688,355.52
5. Step 5: Solve for x
   x = 1,688,355.52/1,308.86
6. Step 6: Final answer
   x = 1,289.94