Finding the Third Proportional to 312,061.50 and 672,191

Step by Step Solution

1. Step 1: Write the proportion equation
   312,061.50 : 672,191 = 672,191 : x
2. Step 2: Convert to fraction form
   312,061.50/672,191 = 672,191/x
3. Step 3: Cross multiply
   312,061.50x = 672,191 × 672,191
4. Step 4: Simplify right side
   312,061.50x = 451,840,740,481
5. Step 5: Solve for x
   x = 451,840,740,481/312,061.50
6. Step 6: Final answer
   x = 1,447,922.09