Finding the Third Proportional to 5,215,472 and 10,578,336

Step by Step Solution

1. Step 1: Write the proportion equation
   5,215,472 : 10,578,336 = 10,578,336 : x
2. Step 2: Convert to fraction form
   5,215,472/10,578,336 = 10,578,336/x
3. Step 3: Cross multiply
   5,215,472x = 10,578,336 × 10,578,336
4. Step 4: Simplify right side
   5,215,472x = 111,901,192,528,896
5. Step 5: Solve for x
   x = 111,901,192,528,896/5,215,472
6. Step 6: Final answer
   x = 21,455,621.38