Finding the Third Proportional to 13,647.50 and 20,490

Step by Step Solution

1. Step 1: Write the proportion equation
   13,647.50 : 20,490 = 20,490 : x
2. Step 2: Convert to fraction form
   13,647.50/20,490 = 20,490/x
3. Step 3: Cross multiply
   13,647.50x = 20,490 × 20,490
4. Step 4: Simplify right side
   13,647.50x = 419,840,100
5. Step 5: Solve for x
   x = 419,840,100/13,647.50
6. Step 6: Final answer
   x = 30,763.15