Finding the Third Proportional to 13,221 and 20,488.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,221 : 20,488.50 = 20,488.50 : x
2. Step 2: Convert to fraction form
   13,221/20,488.50 = 20,488.50/x
3. Step 3: Cross multiply
   13,221x = 20,488.50 × 20,488.50
4. Step 4: Simplify right side
   13,221x = 419,778,632.25
5. Step 5: Solve for x
   x = 419,778,632.25/13,221
6. Step 6: Final answer
   x = 31,750.90