Finding the Third Proportional to 3,899,532 and 8,415,618

Step by Step Solution

1. Step 1: Write the proportion equation
   3,899,532 : 8,415,618 = 8,415,618 : x
2. Step 2: Convert to fraction form
   3,899,532/8,415,618 = 8,415,618/x
3. Step 3: Cross multiply
   3,899,532x = 8,415,618 × 8,415,618
4. Step 4: Simplify right side
   3,899,532x = 70,822,626,321,924
5. Step 5: Solve for x
   x = 70,822,626,321,924/3,899,532
6. Step 6: Final answer
   x = 18,161,827.19