Finding the Fourth Proportional to 1,399.37, 1,928.74 and 956.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.37 : 1,928.74 = 956.50 : x
2. Step 2: Convert to fraction form
   1,399.37/1,928.74 = 956.50/x
3. Step 3: Cross multiply
   1,399.37x = 1,928.74 × 956.50
4. Step 4: Simplify right side
   1,399.37x = 1,844,839.81
5. Step 5: Solve for x
   x = 1,844,839.81/1,399.37
6. Step 6: Final answer
   x = 1,318.34