Finding the Fourth Proportional to 1,396.56, 1,928.16 and 954.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.56 : 1,928.16 = 954.30 : x
2. Step 2: Convert to fraction form
   1,396.56/1,928.16 = 954.30/x
3. Step 3: Cross multiply
   1,396.56x = 1,928.16 × 954.30
4. Step 4: Simplify right side
   1,396.56x = 1,840,043.09
5. Step 5: Solve for x
   x = 1,840,043.09/1,396.56
6. Step 6: Final answer
   x = 1,317.55