Finding the Fourth Proportional to 1,017.21, 1,522.37 and 646.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.21 : 1,522.37 = 646.84 : x
2. Step 2: Convert to fraction form
   1,017.21/1,522.37 = 646.84/x
3. Step 3: Cross multiply
   1,017.21x = 1,522.37 × 646.84
4. Step 4: Simplify right side
   1,017.21x = 984,729.81
5. Step 5: Solve for x
   x = 984,729.81/1,017.21
6. Step 6: Final answer
   x = 968.07