Finding the Third Proportional to 2,163,420 and 4,616,400

Step by Step Solution

1. Step 1: Write the proportion equation
   2,163,420 : 4,616,400 = 4,616,400 : x
2. Step 2: Convert to fraction form
   2,163,420/4,616,400 = 4,616,400/x
3. Step 3: Cross multiply
   2,163,420x = 4,616,400 × 4,616,400
4. Step 4: Simplify right side
   2,163,420x = 21,311,148,960,000
5. Step 5: Solve for x
   x = 21,311,148,960,000/2,163,420
6. Step 6: Final answer
   x = 9,850,675.76