Finding the Third Proportional to 12,928 and 19,986

Step by Step Solution

1. Step 1: Write the proportion equation
   12,928 : 19,986 = 19,986 : x
2. Step 2: Convert to fraction form
   12,928/19,986 = 19,986/x
3. Step 3: Cross multiply
   12,928x = 19,986 × 19,986
4. Step 4: Simplify right side
   12,928x = 399,440,196
5. Step 5: Solve for x
   x = 399,440,196/12,928
6. Step 6: Final answer
   x = 30,897.29