Finding the Third Proportional to 8,520 and 13,222.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,520 : 13,222.50 = 13,222.50 : x
2. Step 2: Convert to fraction form
   8,520/13,222.50 = 13,222.50/x
3. Step 3: Cross multiply
   8,520x = 13,222.50 × 13,222.50
4. Step 4: Simplify right side
   8,520x = 174,834,506.25
5. Step 5: Solve for x
   x = 174,834,506.25/8,520
6. Step 6: Final answer
   x = 20,520.48