Finding the Third Proportional to 3,658.50 and 8,109

Step by Step Solution

1. Step 1: Write the proportion equation
   3,658.50 : 8,109 = 8,109 : x
2. Step 2: Convert to fraction form
   3,658.50/8,109 = 8,109/x
3. Step 3: Cross multiply
   3,658.50x = 8,109 × 8,109
4. Step 4: Simplify right side
   3,658.50x = 65,755,881
5. Step 5: Solve for x
   x = 65,755,881/3,658.50
6. Step 6: Final answer
   x = 17,973.45