Finding the Third Proportional to 13,153.50 and 20,121.75

Step by Step Solution

1. Step 1: Write the proportion equation
   13,153.50 : 20,121.75 = 20,121.75 : x
2. Step 2: Convert to fraction form
   13,153.50/20,121.75 = 20,121.75/x
3. Step 3: Cross multiply
   13,153.50x = 20,121.75 × 20,121.75
4. Step 4: Simplify right side
   13,153.50x = 404,884,823.06
5. Step 5: Solve for x
   x = 404,884,823.06/13,153.50
6. Step 6: Final answer
   x = 30,781.53