Finding the Third Proportional to 5,112.49 and 8,121.52

Step by Step Solution

1. Step 1: Write the proportion equation
   5,112.49 : 8,121.52 = 8,121.52 : x
2. Step 2: Convert to fraction form
   5,112.49/8,121.52 = 8,121.52/x
3. Step 3: Cross multiply
   5,112.49x = 8,121.52 × 8,121.52
4. Step 4: Simplify right side
   5,112.49x = 65,959,016.05
5. Step 5: Solve for x
   x = 65,959,016.05/5,112.49
6. Step 6: Final answer
   x = 12,901.54