Finding the Third Proportional to 378,976 and 815,300

Step by Step Solution

1. Step 1: Write the proportion equation
   378,976 : 815,300 = 815,300 : x
2. Step 2: Convert to fraction form
   378,976/815,300 = 815,300/x
3. Step 3: Cross multiply
   378,976x = 815,300 × 815,300
4. Step 4: Simplify right side
   378,976x = 664,714,090,000
5. Step 5: Solve for x
   x = 664,714,090,000/378,976
6. Step 6: Final answer
   x = 1,753,974.10