Finding the Fourth Proportional to 1,017.28, 1,399.98 and 973.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.28 : 1,399.98 = 973.54 : x
2. Step 2: Convert to fraction form
   1,017.28/1,399.98 = 973.54/x
3. Step 3: Cross multiply
   1,017.28x = 1,399.98 × 973.54
4. Step 4: Simplify right side
   1,017.28x = 1,362,936.53
5. Step 5: Solve for x
   x = 1,362,936.53/1,017.28
6. Step 6: Final answer
   x = 1,339.79