Finding the Third Proportional to 315,445,021.50 and 686,436,003.50

Step by Step Solution

1. Step 1: Write the proportion equation
   315,445,021.50 : 686,436,003.50 = 686,436,003.50 : x
2. Step 2: Convert to fraction form
   315,445,021.50/686,436,003.50 = 686,436,003.50/x
3. Step 3: Cross multiply
   315,445,021.50x = 686,436,003.50 × 686,436,003.50
4. Step 4: Simplify right side
   315,445,021.50x = 471,194,386,901,052,032
5. Step 5: Solve for x
   x = 471,194,386,901,052,032/315,445,021.50
6. Step 6: Final answer
   x = 1,493,744,883.53