Finding the Third Proportional to 8,420.75 and 13,171.25

Step by Step Solution

1. Step 1: Write the proportion equation
   8,420.75 : 13,171.25 = 13,171.25 : x
2. Step 2: Convert to fraction form
   8,420.75/13,171.25 = 13,171.25/x
3. Step 3: Cross multiply
   8,420.75x = 13,171.25 × 13,171.25
4. Step 4: Simplify right side
   8,420.75x = 173,481,826.56
5. Step 5: Solve for x
   x = 173,481,826.56/8,420.75
6. Step 6: Final answer
   x = 20,601.71