Finding the Fourth Proportional to 82,968.57, 124,452.59 and 20,639.07

Step by Step Solution

1. Step 1: Write the proportion equation
   82,968.57 : 124,452.59 = 20,639.07 : x
2. Step 2: Convert to fraction form
   82,968.57/124,452.59 = 20,639.07/x
3. Step 3: Cross multiply
   82,968.57x = 124,452.59 × 20,639.07
4. Step 4: Simplify right side
   82,968.57x = 2,568,585,613.50
5. Step 5: Solve for x
   x = 2,568,585,613.50/82,968.57
6. Step 6: Final answer
   x = 30,958.54