Finding the Third Proportional to 3,889,620 and 8,487,828

Step by Step Solution

1. Step 1: Write the proportion equation
   3,889,620 : 8,487,828 = 8,487,828 : x
2. Step 2: Convert to fraction form
   3,889,620/8,487,828 = 8,487,828/x
3. Step 3: Cross multiply
   3,889,620x = 8,487,828 × 8,487,828
4. Step 4: Simplify right side
   3,889,620x = 72,043,224,157,584
5. Step 5: Solve for x
   x = 72,043,224,157,584/3,889,620
6. Step 6: Final answer
   x = 18,521,918.38