Finding the Third Proportional to 81,653,401,836 and 128,089,977,912

Step by Step Solution

1. Step 1: Write the proportion equation
   81,653,401,836 : 128,089,977,912 = 128,089,977,912 : x
2. Step 2: Convert to fraction form
   81,653,401,836/128,089,977,912 = 128,089,977,912/x
3. Step 3: Cross multiply
   81,653,401,836x = 128,089,977,912 × 128,089,977,912
4. Step 4: Simplify right side
   81,653,401,836x = 16,407,042,441,496,647,172,096
5. Step 5: Solve for x
   x = 16,407,042,441,496,647,172,096/81,653,401,836
6. Step 6: Final answer
   x = 200,935,197,708.60