Finding the Third Proportional to 3,992.41 and 8,398.63

Step by Step Solution

1. Step 1: Write the proportion equation
   3,992.41 : 8,398.63 = 8,398.63 : x
2. Step 2: Convert to fraction form
   3,992.41/8,398.63 = 8,398.63/x
3. Step 3: Cross multiply
   3,992.41x = 8,398.63 × 8,398.63
4. Step 4: Simplify right side
   3,992.41x = 70,536,901.89
5. Step 5: Solve for x
   x = 70,536,901.89/3,992.41
6. Step 6: Final answer
   x = 17,667.77