Finding the Third Proportional to 305,739 and 648,474.75

Step by Step Solution

1. Step 1: Write the proportion equation
   305,739 : 648,474.75 = 648,474.75 : x
2. Step 2: Convert to fraction form
   305,739/648,474.75 = 648,474.75/x
3. Step 3: Cross multiply
   305,739x = 648,474.75 × 648,474.75
4. Step 4: Simplify right side
   305,739x = 420,519,501,387.56
5. Step 5: Solve for x
   x = 420,519,501,387.56/305,739
6. Step 6: Final answer
   x = 1,375,419.89