Finding the Third Proportional to 210,878 and 308,890

Step by Step Solution

1. Step 1: Write the proportion equation
   210,878 : 308,890 = 308,890 : x
2. Step 2: Convert to fraction form
   210,878/308,890 = 308,890/x
3. Step 3: Cross multiply
   210,878x = 308,890 × 308,890
4. Step 4: Simplify right side
   210,878x = 95,413,032,100
5. Step 5: Solve for x
   x = 95,413,032,100/210,878
6. Step 6: Final answer
   x = 452,456.07