Finding the Fourth Proportional to 2,639.84, 3,958.38 and 1,322.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.84 : 3,958.38 = 1,322.16 : x
2. Step 2: Convert to fraction form
   2,639.84/3,958.38 = 1,322.16/x
3. Step 3: Cross multiply
   2,639.84x = 3,958.38 × 1,322.16
4. Step 4: Simplify right side
   2,639.84x = 5,233,611.70
5. Step 5: Solve for x
   x = 5,233,611.70/2,639.84
6. Step 6: Final answer
   x = 1,982.55