Finding the Fourth Proportional to 1,399.60, 1,929.45 and 956.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.60 : 1,929.45 = 956.80 : x
2. Step 2: Convert to fraction form
   1,399.60/1,929.45 = 956.80/x
3. Step 3: Cross multiply
   1,399.60x = 1,929.45 × 956.80
4. Step 4: Simplify right side
   1,399.60x = 1,846,097.76
5. Step 5: Solve for x
   x = 1,846,097.76/1,399.60
6. Step 6: Final answer
   x = 1,319.02