Finding the Third Proportional to 9,890,284 and 20,538,242

Step by Step Solution

1. Step 1: Write the proportion equation
   9,890,284 : 20,538,242 = 20,538,242 : x
2. Step 2: Convert to fraction form
   9,890,284/20,538,242 = 20,538,242/x
3. Step 3: Cross multiply
   9,890,284x = 20,538,242 × 20,538,242
4. Step 4: Simplify right side
   9,890,284x = 421,819,384,450,564
5. Step 5: Solve for x
   x = 421,819,384,450,564/9,890,284
6. Step 6: Final answer
   x = 42,649,875.82