Finding the Fourth Proportional to 1,288.73, 1,931.73 and 936.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.73 : 1,931.73 = 936.50 : x
2. Step 2: Convert to fraction form
   1,288.73/1,931.73 = 936.50/x
3. Step 3: Cross multiply
   1,288.73x = 1,931.73 × 936.50
4. Step 4: Simplify right side
   1,288.73x = 1,809,055.49
5. Step 5: Solve for x
   x = 1,809,055.49/1,288.73
6. Step 6: Final answer
   x = 1,403.76