Finding the Fourth Proportional to 1,399.49, 1,928.92 and 956.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.49 : 1,928.92 = 956.63 : x
2. Step 2: Convert to fraction form
   1,399.49/1,928.92 = 956.63/x
3. Step 3: Cross multiply
   1,399.49x = 1,928.92 × 956.63
4. Step 4: Simplify right side
   1,399.49x = 1,845,248.31
5. Step 5: Solve for x
   x = 1,845,248.31/1,399.49
6. Step 6: Final answer
   x = 1,318.51