Finding the Third Proportional to 3,695.63 and 8,209.69

Step by Step Solution

1. Step 1: Write the proportion equation
   3,695.63 : 8,209.69 = 8,209.69 : x
2. Step 2: Convert to fraction form
   3,695.63/8,209.69 = 8,209.69/x
3. Step 3: Cross multiply
   3,695.63x = 8,209.69 × 8,209.69
4. Step 4: Simplify right side
   3,695.63x = 67,398,968.85
5. Step 5: Solve for x
   x = 67,398,968.85/3,695.63
6. Step 6: Final answer
   x = 18,237.50