Finding the Third Proportional to 312,903 and 672,978.38

Step by Step Solution

1. Step 1: Write the proportion equation
   312,903 : 672,978.38 = 672,978.38 : x
2. Step 2: Convert to fraction form
   312,903/672,978.38 = 672,978.38/x
3. Step 3: Cross multiply
   312,903x = 672,978.38 × 672,978.38
4. Step 4: Simplify right side
   312,903x = 452,899,893,217.64
5. Step 5: Solve for x
   x = 452,899,893,217.64/312,903
6. Step 6: Final answer
   x = 1,447,413.07