Finding the Third Proportional to 100,570.78 and 209,410.73

Step by Step Solution

1. Step 1: Write the proportion equation
   100,570.78 : 209,410.73 = 209,410.73 : x
2. Step 2: Convert to fraction form
   100,570.78/209,410.73 = 209,410.73/x
3. Step 3: Cross multiply
   100,570.78x = 209,410.73 × 209,410.73
4. Step 4: Simplify right side
   100,570.78x = 43,852,855,671.48
5. Step 5: Solve for x
   x = 43,852,855,671.48/100,570.78
6. Step 6: Final answer
   x = 436,039.72