Finding the Third Proportional to 8,472.50 and 12,771.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,472.50 : 12,771.50 = 12,771.50 : x
2. Step 2: Convert to fraction form
   8,472.50/12,771.50 = 12,771.50/x
3. Step 3: Cross multiply
   8,472.50x = 12,771.50 × 12,771.50
4. Step 4: Simplify right side
   8,472.50x = 163,111,212.25
5. Step 5: Solve for x
   x = 163,111,212.25/8,472.50
6. Step 6: Final answer
   x = 19,251.84