Finding the Third Proportional to 5,007.94 and 8,139.47

Step by Step Solution

1. Step 1: Write the proportion equation
   5,007.94 : 8,139.47 = 8,139.47 : x
2. Step 2: Convert to fraction form
   5,007.94/8,139.47 = 8,139.47/x
3. Step 3: Cross multiply
   5,007.94x = 8,139.47 × 8,139.47
4. Step 4: Simplify right side
   5,007.94x = 66,250,951.53
5. Step 5: Solve for x
   x = 66,250,951.53/5,007.94
6. Step 6: Final answer
   x = 13,229.19