Finding the Third Proportional to 5,447.81 and 8,418.09

Step by Step Solution

1. Step 1: Write the proportion equation
   5,447.81 : 8,418.09 = 8,418.09 : x
2. Step 2: Convert to fraction form
   5,447.81/8,418.09 = 8,418.09/x
3. Step 3: Cross multiply
   5,447.81x = 8,418.09 × 8,418.09
4. Step 4: Simplify right side
   5,447.81x = 70,864,302.38
5. Step 5: Solve for x
   x = 70,864,302.38/5,447.81
6. Step 6: Final answer
   x = 13,007.85