Finding the Third Proportional to 301,815 and 639,608.63

Step by Step Solution

1. Step 1: Write the proportion equation
   301,815 : 639,608.63 = 639,608.63 : x
2. Step 2: Convert to fraction form
   301,815/639,608.63 = 639,608.63/x
3. Step 3: Cross multiply
   301,815x = 639,608.63 × 639,608.63
4. Step 4: Simplify right side
   301,815x = 409,099,193,174.39
5. Step 5: Solve for x
   x = 409,099,193,174.39/301,815
6. Step 6: Final answer
   x = 1,355,463.42