Finding the Third Proportional to 5,429,958 and 7,978,724

Step by Step Solution

1. Step 1: Write the proportion equation
   5,429,958 : 7,978,724 = 7,978,724 : x
2. Step 2: Convert to fraction form
   5,429,958/7,978,724 = 7,978,724/x
3. Step 3: Cross multiply
   5,429,958x = 7,978,724 × 7,978,724
4. Step 4: Simplify right side
   5,429,958x = 63,660,036,668,176
5. Step 5: Solve for x
   x = 63,660,036,668,176/5,429,958
6. Step 6: Final answer
   x = 11,723,854.34