Finding the Third Proportional to 3,899.39 and 8,364.52

Step by Step Solution

1. Step 1: Write the proportion equation
   3,899.39 : 8,364.52 = 8,364.52 : x
2. Step 2: Convert to fraction form
   3,899.39/8,364.52 = 8,364.52/x
3. Step 3: Cross multiply
   3,899.39x = 8,364.52 × 8,364.52
4. Step 4: Simplify right side
   3,899.39x = 69,965,121.64
5. Step 5: Solve for x
   x = 69,965,121.64/3,899.39
6. Step 6: Final answer
   x = 17,942.58