Finding the Third Proportional to 4,978,212 and 10,857,420

Step by Step Solution

1. Step 1: Write the proportion equation
   4,978,212 : 10,857,420 = 10,857,420 : x
2. Step 2: Convert to fraction form
   4,978,212/10,857,420 = 10,857,420/x
3. Step 3: Cross multiply
   4,978,212x = 10,857,420 × 10,857,420
4. Step 4: Simplify right side
   4,978,212x = 117,883,569,056,400
5. Step 5: Solve for x
   x = 117,883,569,056,400/4,978,212
6. Step 6: Final answer
   x = 23,679,901.35