Finding the Third Proportional to 399,673,672 and 599,510,468

Step by Step Solution

1. Step 1: Write the proportion equation
   399,673,672 : 599,510,468 = 599,510,468 : x
2. Step 2: Convert to fraction form
   399,673,672/599,510,468 = 599,510,468/x
3. Step 3: Cross multiply
   399,673,672x = 599,510,468 × 599,510,468
4. Step 4: Simplify right side
   399,673,672x = 359,412,801,241,579,008
5. Step 5: Solve for x
   x = 359,412,801,241,579,008/399,673,672
6. Step 6: Final answer
   x = 899,265,642.00