Finding the Third Proportional to 18,399,434,123 and 40,022,638,978

Step by Step Solution

1. Step 1: Write the proportion equation
   18,399,434,123 : 40,022,638,978 = 40,022,638,978 : x
2. Step 2: Convert to fraction form
   18,399,434,123/40,022,638,978 = 40,022,638,978/x
3. Step 3: Cross multiply
   18,399,434,123x = 40,022,638,978 × 40,022,638,978
4. Step 4: Simplify right side
   18,399,434,123x = 1,601,811,630,763,324,997,632
5. Step 5: Solve for x
   x = 1,601,811,630,763,324,997,632/18,399,434,123
6. Step 6: Final answer
   x = 87,057,657,320.07