Finding the Third Proportional to 12,679.88 and 19,710.84

Step by Step Solution

1. Step 1: Write the proportion equation
   12,679.88 : 19,710.84 = 19,710.84 : x
2. Step 2: Convert to fraction form
   12,679.88/19,710.84 = 19,710.84/x
3. Step 3: Cross multiply
   12,679.88x = 19,710.84 × 19,710.84
4. Step 4: Simplify right side
   12,679.88x = 388,517,361.34
5. Step 5: Solve for x
   x = 388,517,361.34/12,679.88
6. Step 6: Final answer
   x = 30,640.47