Finding the Third Proportional to 5,215,901 and 7,978,754

Step by Step Solution

1. Step 1: Write the proportion equation
   5,215,901 : 7,978,754 = 7,978,754 : x
2. Step 2: Convert to fraction form
   5,215,901/7,978,754 = 7,978,754/x
3. Step 3: Cross multiply
   5,215,901x = 7,978,754 × 7,978,754
4. Step 4: Simplify right side
   5,215,901x = 63,660,515,392,516
5. Step 5: Solve for x
   x = 63,660,515,392,516/5,215,901
6. Step 6: Final answer
   x = 12,205,085.06