Finding the Third Proportional to 3,904.31 and 8,380.69

Step by Step Solution

1. Step 1: Write the proportion equation
   3,904.31 : 8,380.69 = 8,380.69 : x
2. Step 2: Convert to fraction form
   3,904.31/8,380.69 = 8,380.69/x
3. Step 3: Cross multiply
   3,904.31x = 8,380.69 × 8,380.69
4. Step 4: Simplify right side
   3,904.31x = 70,235,922.97
5. Step 5: Solve for x
   x = 70,235,922.97/3,904.31
6. Step 6: Final answer
   x = 17,989.32