Finding the Third Proportional to 8,620 and 13,180.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,620 : 13,180.50 = 13,180.50 : x
2. Step 2: Convert to fraction form
   8,620/13,180.50 = 13,180.50/x
3. Step 3: Cross multiply
   8,620x = 13,180.50 × 13,180.50
4. Step 4: Simplify right side
   8,620x = 173,725,580.25
5. Step 5: Solve for x
   x = 173,725,580.25/8,620
6. Step 6: Final answer
   x = 20,153.78