Finding the Third Proportional to 3,129,880 and 6,857,540

Step by Step Solution

1. Step 1: Write the proportion equation
   3,129,880 : 6,857,540 = 6,857,540 : x
2. Step 2: Convert to fraction form
   3,129,880/6,857,540 = 6,857,540/x
3. Step 3: Cross multiply
   3,129,880x = 6,857,540 × 6,857,540
4. Step 4: Simplify right side
   3,129,880x = 47,025,854,851,600
5. Step 5: Solve for x
   x = 47,025,854,851,600/3,129,880
6. Step 6: Final answer
   x = 15,024,810.81