Finding the Third Proportional to 3,665.38 and 8,643.88

Step by Step Solution

1. Step 1: Write the proportion equation
   3,665.38 : 8,643.88 = 8,643.88 : x
2. Step 2: Convert to fraction form
   3,665.38/8,643.88 = 8,643.88/x
3. Step 3: Cross multiply
   3,665.38x = 8,643.88 × 8,643.88
4. Step 4: Simplify right side
   3,665.38x = 74,716,575.02
5. Step 5: Solve for x
   x = 74,716,575.02/3,665.38
6. Step 6: Final answer
   x = 20,384.43