Finding the Third Proportional to 2,212.88 and 5,121.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,212.88 : 5,121.56 = 5,121.56 : x
2. Step 2: Convert to fraction form
   2,212.88/5,121.56 = 5,121.56/x
3. Step 3: Cross multiply
   2,212.88x = 5,121.56 × 5,121.56
4. Step 4: Simplify right side
   2,212.88x = 26,230,402.44
5. Step 5: Solve for x
   x = 26,230,402.44/2,212.88
6. Step 6: Final answer
   x = 11,853.54