Finding the Third Proportional to 81,653,401,838 and 128,089,977,915

Step by Step Solution

1. Step 1: Write the proportion equation
   81,653,401,838 : 128,089,977,915 = 128,089,977,915 : x
2. Step 2: Convert to fraction form
   81,653,401,838/128,089,977,915 = 128,089,977,915/x
3. Step 3: Cross multiply
   81,653,401,838x = 128,089,977,915 × 128,089,977,915
4. Step 4: Simplify right side
   81,653,401,838x = 16,407,042,442,265,188,368,384
5. Step 5: Solve for x
   x = 16,407,042,442,265,188,368,384/81,653,401,838
6. Step 6: Final answer
   x = 200,935,197,713.09