Finding the Third Proportional to 1,939,664 and 4,215,072

Step by Step Solution

1. Step 1: Write the proportion equation
   1,939,664 : 4,215,072 = 4,215,072 : x
2. Step 2: Convert to fraction form
   1,939,664/4,215,072 = 4,215,072/x
3. Step 3: Cross multiply
   1,939,664x = 4,215,072 × 4,215,072
4. Step 4: Simplify right side
   1,939,664x = 17,766,831,965,184
5. Step 5: Solve for x
   x = 17,766,831,965,184/1,939,664
6. Step 6: Final answer
   x = 9,159,747.24