Finding the Third Proportional to 13,921 and 20,131.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,921 : 20,131.50 = 20,131.50 : x
2. Step 2: Convert to fraction form
   13,921/20,131.50 = 20,131.50/x
3. Step 3: Cross multiply
   13,921x = 20,131.50 × 20,131.50
4. Step 4: Simplify right side
   13,921x = 405,277,292.25
5. Step 5: Solve for x
   x = 405,277,292.25/13,921
6. Step 6: Final answer
   x = 29,112.66