Finding the Third Proportional to 50,766,678 and 78,478,812

Step by Step Solution

1. Step 1: Write the proportion equation
   50,766,678 : 78,478,812 = 78,478,812 : x
2. Step 2: Convert to fraction form
   50,766,678/78,478,812 = 78,478,812/x
3. Step 3: Cross multiply
   50,766,678x = 78,478,812 × 78,478,812
4. Step 4: Simplify right side
   50,766,678x = 6,158,923,932,931,344
5. Step 5: Solve for x
   x = 6,158,923,932,931,344/50,766,678
6. Step 6: Final answer
   x = 121,318,238.17