Finding the Third Proportional to 5,429,930 and 7,978,682

Step by Step Solution

1. Step 1: Write the proportion equation
   5,429,930 : 7,978,682 = 7,978,682 : x
2. Step 2: Convert to fraction form
   5,429,930/7,978,682 = 7,978,682/x
3. Step 3: Cross multiply
   5,429,930x = 7,978,682 × 7,978,682
4. Step 4: Simplify right side
   5,429,930x = 63,659,366,457,124
5. Step 5: Solve for x
   x = 63,659,366,457,124/5,429,930
6. Step 6: Final answer
   x = 11,723,791.37