Finding the Third Proportional to 12,679.69 and 19,710.66

Step by Step Solution

1. Step 1: Write the proportion equation
   12,679.69 : 19,710.66 = 19,710.66 : x
2. Step 2: Convert to fraction form
   12,679.69/19,710.66 = 19,710.66/x
3. Step 3: Cross multiply
   12,679.69x = 19,710.66 × 19,710.66
4. Step 4: Simplify right side
   12,679.69x = 388,509,969.81
5. Step 5: Solve for x
   x = 388,509,969.81/12,679.69
6. Step 6: Final answer
   x = 30,640.34