Finding the Fourth Proportional to 1,399.62, 1,929.09 and 956.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.62 : 1,929.09 = 956.76 : x
2. Step 2: Convert to fraction form
   1,399.62/1,929.09 = 956.76/x
3. Step 3: Cross multiply
   1,399.62x = 1,929.09 × 956.76
4. Step 4: Simplify right side
   1,399.62x = 1,845,676.15
5. Step 5: Solve for x
   x = 1,845,676.15/1,399.62
6. Step 6: Final answer
   x = 1,318.70