Finding the Third Proportional to 4,581,578 and 9,871,256

Step by Step Solution

1. Step 1: Write the proportion equation
   4,581,578 : 9,871,256 = 9,871,256 : x
2. Step 2: Convert to fraction form
   4,581,578/9,871,256 = 9,871,256/x
3. Step 3: Cross multiply
   4,581,578x = 9,871,256 × 9,871,256
4. Step 4: Simplify right side
   4,581,578x = 97,441,695,017,536
5. Step 5: Solve for x
   x = 97,441,695,017,536/4,581,578
6. Step 6: Final answer
   x = 21,268,151.50