Finding the Third Proportional to 215,795,009 and 315,499,849.50

Step by Step Solution

1. Step 1: Write the proportion equation
   215,795,009 : 315,499,849.50 = 315,499,849.50 : x
2. Step 2: Convert to fraction form
   215,795,009/315,499,849.50 = 315,499,849.50/x
3. Step 3: Cross multiply
   215,795,009x = 315,499,849.50 × 315,499,849.50
4. Step 4: Simplify right side
   215,795,009x = 99,540,155,034,522,656
5. Step 5: Solve for x
   x = 99,540,155,034,522,656/215,795,009
6. Step 6: Final answer
   x = 461,271,812.98