Finding the Third Proportional to 5,509.09 and 12,111.69

Step by Step Solution

1. Step 1: Write the proportion equation
   5,509.09 : 12,111.69 = 12,111.69 : x
2. Step 2: Convert to fraction form
   5,509.09/12,111.69 = 12,111.69/x
3. Step 3: Cross multiply
   5,509.09x = 12,111.69 × 12,111.69
4. Step 4: Simplify right side
   5,509.09x = 146,692,974.10
5. Step 5: Solve for x
   x = 146,692,974.10/5,509.09
6. Step 6: Final answer
   x = 26,627.42