Finding the Third Proportional to 3,880,621 and 8,163,420

Step by Step Solution

1. Step 1: Write the proportion equation
   3,880,621 : 8,163,420 = 8,163,420 : x
2. Step 2: Convert to fraction form
   3,880,621/8,163,420 = 8,163,420/x
3. Step 3: Cross multiply
   3,880,621x = 8,163,420 × 8,163,420
4. Step 4: Simplify right side
   3,880,621x = 66,641,426,096,400
5. Step 5: Solve for x
   x = 66,641,426,096,400/3,880,621
6. Step 6: Final answer
   x = 17,172,876.74