Finding the Third Proportional to 8,398.69 and 13,309.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,398.69 : 13,309.31 = 13,309.31 : x
2. Step 2: Convert to fraction form
   8,398.69/13,309.31 = 13,309.31/x
3. Step 3: Cross multiply
   8,398.69x = 13,309.31 × 13,309.31
4. Step 4: Simplify right side
   8,398.69x = 177,137,799.22
5. Step 5: Solve for x
   x = 177,137,799.22/8,398.69
6. Step 6: Final answer
   x = 21,091.13