Finding the Third Proportional to 5,429,922 and 7,978,670

Step by Step Solution

1. Step 1: Write the proportion equation
   5,429,922 : 7,978,670 = 7,978,670 : x
2. Step 2: Convert to fraction form
   5,429,922/7,978,670 = 7,978,670/x
3. Step 3: Cross multiply
   5,429,922x = 7,978,670 × 7,978,670
4. Step 4: Simplify right side
   5,429,922x = 63,659,174,968,900
5. Step 5: Solve for x
   x = 63,659,174,968,900/5,429,922
6. Step 6: Final answer
   x = 11,723,773.37