Finding the Third Proportional to 12,766.78 and 19,688.48

Step by Step Solution

1. Step 1: Write the proportion equation
   12,766.78 : 19,688.48 = 19,688.48 : x
2. Step 2: Convert to fraction form
   12,766.78/19,688.48 = 19,688.48/x
3. Step 3: Cross multiply
   12,766.78x = 19,688.48 × 19,688.48
4. Step 4: Simplify right side
   12,766.78x = 387,636,416.98
5. Step 5: Solve for x
   x = 387,636,416.98/12,766.78
6. Step 6: Final answer
   x = 30,362.89