Finding the Fourth Proportional to 1,398.99, 1,928.23 and 956.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.99 : 1,928.23 = 956.12 : x
2. Step 2: Convert to fraction form
   1,398.99/1,928.23 = 956.12/x
3. Step 3: Cross multiply
   1,398.99x = 1,928.23 × 956.12
4. Step 4: Simplify right side
   1,398.99x = 1,843,619.27
5. Step 5: Solve for x
   x = 1,843,619.27/1,398.99
6. Step 6: Final answer
   x = 1,317.82