Finding the Third Proportional to 4,207,538 and 9,215,988

Step by Step Solution

1. Step 1: Write the proportion equation
   4,207,538 : 9,215,988 = 9,215,988 : x
2. Step 2: Convert to fraction form
   4,207,538/9,215,988 = 9,215,988/x
3. Step 3: Cross multiply
   4,207,538x = 9,215,988 × 9,215,988
4. Step 4: Simplify right side
   4,207,538x = 84,934,434,816,144
5. Step 5: Solve for x
   x = 84,934,434,816,144/4,207,538
6. Step 6: Final answer
   x = 20,186,254.96