Finding the Third Proportional to 2,689.31 and 5,811.19

Step by Step Solution

1. Step 1: Write the proportion equation
   2,689.31 : 5,811.19 = 5,811.19 : x
2. Step 2: Convert to fraction form
   2,689.31/5,811.19 = 5,811.19/x
3. Step 3: Cross multiply
   2,689.31x = 5,811.19 × 5,811.19
4. Step 4: Simplify right side
   2,689.31x = 33,769,900.16
5. Step 5: Solve for x
   x = 33,769,900.16/2,689.31
6. Step 6: Final answer
   x = 12,557.08