Finding the Third Proportional to 12,723.75 and 21,691.13

Step by Step Solution

1. Step 1: Write the proportion equation
   12,723.75 : 21,691.13 = 21,691.13 : x
2. Step 2: Convert to fraction form
   12,723.75/21,691.13 = 21,691.13/x
3. Step 3: Cross multiply
   12,723.75x = 21,691.13 × 21,691.13
4. Step 4: Simplify right side
   12,723.75x = 470,504,903.77
5. Step 5: Solve for x
   x = 470,504,903.77/12,723.75
6. Step 6: Final answer
   x = 36,978.48