Finding the Third Proportional to 401,665,119 and 620,674,454

Step by Step Solution

1. Step 1: Write the proportion equation
   401,665,119 : 620,674,454 = 620,674,454 : x
2. Step 2: Convert to fraction form
   401,665,119/620,674,454 = 620,674,454/x
3. Step 3: Cross multiply
   401,665,119x = 620,674,454 × 620,674,454
4. Step 4: Simplify right side
   401,665,119x = 385,236,777,848,198,144
5. Step 5: Solve for x
   x = 385,236,777,848,198,144/401,665,119
6. Step 6: Final answer
   x = 959,099,408.00