Finding the Third Proportional to 8,439 and 13,100.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,439 : 13,100.50 = 13,100.50 : x
2. Step 2: Convert to fraction form
   8,439/13,100.50 = 13,100.50/x
3. Step 3: Cross multiply
   8,439x = 13,100.50 × 13,100.50
4. Step 4: Simplify right side
   8,439x = 171,623,100.25
5. Step 5: Solve for x
   x = 171,623,100.25/8,439
6. Step 6: Final answer
   x = 20,336.90