Finding the Third Proportional to 13,128 and 20,879.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,128 : 20,879.50 = 20,879.50 : x
2. Step 2: Convert to fraction form
   13,128/20,879.50 = 20,879.50/x
3. Step 3: Cross multiply
   13,128x = 20,879.50 × 20,879.50
4. Step 4: Simplify right side
   13,128x = 435,953,520.25
5. Step 5: Solve for x
   x = 435,953,520.25/13,128
6. Step 6: Final answer
   x = 33,207.92