Finding the Third Proportional to 12,728.50 and 19,116.75

Step by Step Solution

1. Step 1: Write the proportion equation
   12,728.50 : 19,116.75 = 19,116.75 : x
2. Step 2: Convert to fraction form
   12,728.50/19,116.75 = 19,116.75/x
3. Step 3: Cross multiply
   12,728.50x = 19,116.75 × 19,116.75
4. Step 4: Simplify right side
   12,728.50x = 365,450,130.56
5. Step 5: Solve for x
   x = 365,450,130.56/12,728.50
6. Step 6: Final answer
   x = 28,711.17