Finding the Third Proportional to 5,215,924 and 7,978,808

Step by Step Solution

1. Step 1: Write the proportion equation
   5,215,924 : 7,978,808 = 7,978,808 : x
2. Step 2: Convert to fraction form
   5,215,924/7,978,808 = 7,978,808/x
3. Step 3: Cross multiply
   5,215,924x = 7,978,808 × 7,978,808
4. Step 4: Simplify right side
   5,215,924x = 63,661,377,100,864
5. Step 5: Solve for x
   x = 63,661,377,100,864/5,215,924
6. Step 6: Final answer
   x = 12,205,196.45