Finding the Third Proportional to 9,908,940 and 21,008,658

Step by Step Solution

1. Step 1: Write the proportion equation
   9,908,940 : 21,008,658 = 21,008,658 : x
2. Step 2: Convert to fraction form
   9,908,940/21,008,658 = 21,008,658/x
3. Step 3: Cross multiply
   9,908,940x = 21,008,658 × 21,008,658
4. Step 4: Simplify right side
   9,908,940x = 441,363,710,960,964
5. Step 5: Solve for x
   x = 441,363,710,960,964/9,908,940
6. Step 6: Final answer
   x = 44,541,970.28