Finding the Third Proportional to 20,986,440 and 30,879,540

Step by Step Solution

1. Step 1: Write the proportion equation
   20,986,440 : 30,879,540 = 30,879,540 : x
2. Step 2: Convert to fraction form
   20,986,440/30,879,540 = 30,879,540/x
3. Step 3: Cross multiply
   20,986,440x = 30,879,540 × 30,879,540
4. Step 4: Simplify right side
   20,986,440x = 953,545,990,611,600
5. Step 5: Solve for x
   x = 953,545,990,611,600/20,986,440
6. Step 6: Final answer
   x = 45,436,290.80