Finding the Third Proportional to 5,315,872 and 7,972,144

Step by Step Solution

1. Step 1: Write the proportion equation
   5,315,872 : 7,972,144 = 7,972,144 : x
2. Step 2: Convert to fraction form
   5,315,872/7,972,144 = 7,972,144/x
3. Step 3: Cross multiply
   5,315,872x = 7,972,144 × 7,972,144
4. Step 4: Simplify right side
   5,315,872x = 63,555,079,956,736
5. Step 5: Solve for x
   x = 63,555,079,956,736/5,315,872
6. Step 6: Final answer
   x = 11,955,720.52