Finding the Third Proportional to 8,415 and 13,168.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,415 : 13,168.50 = 13,168.50 : x
2. Step 2: Convert to fraction form
   8,415/13,168.50 = 13,168.50/x
3. Step 3: Cross multiply
   8,415x = 13,168.50 × 13,168.50
4. Step 4: Simplify right side
   8,415x = 173,409,392.25
5. Step 5: Solve for x
   x = 173,409,392.25/8,415
6. Step 6: Final answer
   x = 20,607.18