Finding the Third Proportional to 7,978,386 and 17,636,388

Step by Step Solution

1. Step 1: Write the proportion equation
   7,978,386 : 17,636,388 = 17,636,388 : x
2. Step 2: Convert to fraction form
   7,978,386/17,636,388 = 17,636,388/x
3. Step 3: Cross multiply
   7,978,386x = 17,636,388 × 17,636,388
4. Step 4: Simplify right side
   7,978,386x = 311,042,181,686,544
5. Step 5: Solve for x
   x = 311,042,181,686,544/7,978,386
6. Step 6: Final answer
   x = 38,985,602.06