Finding the Third Proportional to 3,987.38 and 8,173.88

Step by Step Solution

1. Step 1: Write the proportion equation
   3,987.38 : 8,173.88 = 8,173.88 : x
2. Step 2: Convert to fraction form
   3,987.38/8,173.88 = 8,173.88/x
3. Step 3: Cross multiply
   3,987.38x = 8,173.88 × 8,173.88
4. Step 4: Simplify right side
   3,987.38x = 66,812,232.52
5. Step 5: Solve for x
   x = 66,812,232.52/3,987.38
6. Step 6: Final answer
   x = 16,755.94