Finding the Third Proportional to 399,673,668 and 599,510,461.50

Step by Step Solution

1. Step 1: Write the proportion equation
   399,673,668 : 599,510,461.50 = 599,510,461.50 : x
2. Step 2: Convert to fraction form
   399,673,668/599,510,461.50 = 599,510,461.50/x
3. Step 3: Cross multiply
   399,673,668x = 599,510,461.50 × 599,510,461.50
4. Step 4: Simplify right side
   399,673,668x = 359,412,793,447,942,976
5. Step 5: Solve for x
   x = 359,412,793,447,942,976/399,673,668
6. Step 6: Final answer
   x = 899,265,631.50