Finding the Third Proportional to 12,688 and 19,607

Step by Step Solution

1. Step 1: Write the proportion equation
   12,688 : 19,607 = 19,607 : x
2. Step 2: Convert to fraction form
   12,688/19,607 = 19,607/x
3. Step 3: Cross multiply
   12,688x = 19,607 × 19,607
4. Step 4: Simplify right side
   12,688x = 384,434,449
5. Step 5: Solve for x
   x = 384,434,449/12,688
6. Step 6: Final answer
   x = 30,299.06