Finding the Third Proportional to 13,447.69 and 20,390.06

Step by Step Solution

1. Step 1: Write the proportion equation
   13,447.69 : 20,390.06 = 20,390.06 : x
2. Step 2: Convert to fraction form
   13,447.69/20,390.06 = 20,390.06/x
3. Step 3: Cross multiply
   13,447.69x = 20,390.06 × 20,390.06
4. Step 4: Simplify right side
   13,447.69x = 415,754,648.75
5. Step 5: Solve for x
   x = 415,754,648.75/13,447.69
6. Step 6: Final answer
   x = 30,916.44