Finding the Third Proportional to 8,424 and 17,840

Step by Step Solution

1. Step 1: Write the proportion equation
   8,424 : 17,840 = 17,840 : x
2. Step 2: Convert to fraction form
   8,424/17,840 = 17,840/x
3. Step 3: Cross multiply
   8,424x = 17,840 × 17,840
4. Step 4: Simplify right side
   8,424x = 318,265,600
5. Step 5: Solve for x
   x = 318,265,600/8,424
6. Step 6: Final answer
   x = 37,780.82