Finding the Third Proportional to 3,872,372 and 8,509,132

Step by Step Solution

1. Step 1: Write the proportion equation
   3,872,372 : 8,509,132 = 8,509,132 : x
2. Step 2: Convert to fraction form
   3,872,372/8,509,132 = 8,509,132/x
3. Step 3: Cross multiply
   3,872,372x = 8,509,132 × 8,509,132
4. Step 4: Simplify right side
   3,872,372x = 72,405,327,393,424
5. Step 5: Solve for x
   x = 72,405,327,393,424/3,872,372
6. Step 6: Final answer
   x = 18,697,926.59