Finding the Third Proportional to 8,721.84 and 13,480.59

Step by Step Solution

1. Step 1: Write the proportion equation
   8,721.84 : 13,480.59 = 13,480.59 : x
2. Step 2: Convert to fraction form
   8,721.84/13,480.59 = 13,480.59/x
3. Step 3: Cross multiply
   8,721.84x = 13,480.59 × 13,480.59
4. Step 4: Simplify right side
   8,721.84x = 181,726,407.85
5. Step 5: Solve for x
   x = 181,726,407.85/8,721.84
6. Step 6: Final answer
   x = 20,835.78