Finding the Third Proportional to 312,060.25 and 672,189

Step by Step Solution

1. Step 1: Write the proportion equation
   312,060.25 : 672,189 = 672,189 : x
2. Step 2: Convert to fraction form
   312,060.25/672,189 = 672,189/x
3. Step 3: Cross multiply
   312,060.25x = 672,189 × 672,189
4. Step 4: Simplify right side
   312,060.25x = 451,838,051,721
5. Step 5: Solve for x
   x = 451,838,051,721/312,060.25
6. Step 6: Final answer
   x = 1,447,919.28