Finding the Third Proportional to 5,578,378 and 8,613,618

Step by Step Solution

1. Step 1: Write the proportion equation
   5,578,378 : 8,613,618 = 8,613,618 : x
2. Step 2: Convert to fraction form
   5,578,378/8,613,618 = 8,613,618/x
3. Step 3: Cross multiply
   5,578,378x = 8,613,618 × 8,613,618
4. Step 4: Simplify right side
   5,578,378x = 74,194,415,049,924
5. Step 5: Solve for x
   x = 74,194,415,049,924/5,578,378
6. Step 6: Final answer
   x = 13,300,356.31