Finding the Third Proportional to 9,681,618 and 21,123,640

Step by Step Solution

1. Step 1: Write the proportion equation
   9,681,618 : 21,123,640 = 21,123,640 : x
2. Step 2: Convert to fraction form
   9,681,618/21,123,640 = 21,123,640/x
3. Step 3: Cross multiply
   9,681,618x = 21,123,640 × 21,123,640
4. Step 4: Simplify right side
   9,681,618x = 446,208,166,849,600
5. Step 5: Solve for x
   x = 446,208,166,849,600/9,681,618
6. Step 6: Final answer
   x = 46,088,181.42