Finding the Third Proportional to 308,128.50 and 672,963.56

Step by Step Solution

1. Step 1: Write the proportion equation
   308,128.50 : 672,963.56 = 672,963.56 : x
2. Step 2: Convert to fraction form
   308,128.50/672,963.56 = 672,963.56/x
3. Step 3: Cross multiply
   308,128.50x = 672,963.56 × 672,963.56
4. Step 4: Simplify right side
   308,128.50x = 452,879,956,452.69
5. Step 5: Solve for x
   x = 452,879,956,452.69/308,128.50
6. Step 6: Final answer
   x = 1,469,776.27