Finding the Third Proportional to 100,488 and 209,245.31

Step by Step Solution

1. Step 1: Write the proportion equation
   100,488 : 209,245.31 = 209,245.31 : x
2. Step 2: Convert to fraction form
   100,488/209,245.31 = 209,245.31/x
3. Step 3: Cross multiply
   100,488x = 209,245.31 × 209,245.31
4. Step 4: Simplify right side
   100,488x = 43,783,600,803.22
5. Step 5: Solve for x
   x = 43,783,600,803.22/100,488
6. Step 6: Final answer
   x = 435,709.74