Finding the Third Proportional to 4,558,738 and 7,218,645

Step by Step Solution

1. Step 1: Write the proportion equation
   4,558,738 : 7,218,645 = 7,218,645 : x
2. Step 2: Convert to fraction form
   4,558,738/7,218,645 = 7,218,645/x
3. Step 3: Cross multiply
   4,558,738x = 7,218,645 × 7,218,645
4. Step 4: Simplify right side
   4,558,738x = 52,108,835,636,025
5. Step 5: Solve for x
   x = 52,108,835,636,025/4,558,738
6. Step 6: Final answer
   x = 11,430,539.69