Finding the Third Proportional to 4,636,487 and 9,958,558

Step by Step Solution

1. Step 1: Write the proportion equation
   4,636,487 : 9,958,558 = 9,958,558 : x
2. Step 2: Convert to fraction form
   4,636,487/9,958,558 = 9,958,558/x
3. Step 3: Cross multiply
   4,636,487x = 9,958,558 × 9,958,558
4. Step 4: Simplify right side
   4,636,487x = 99,172,877,439,364
5. Step 5: Solve for x
   x = 99,172,877,439,364/4,636,487
6. Step 6: Final answer
   x = 21,389,659.33