Finding the Third Proportional to 3,619.69 and 8,603.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,619.69 : 8,603.72 = 8,603.72 : x
2. Step 2: Convert to fraction form
   3,619.69/8,603.72 = 8,603.72/x
3. Step 3: Cross multiply
   3,619.69x = 8,603.72 × 8,603.72
4. Step 4: Simplify right side
   3,619.69x = 74,023,976.33
5. Step 5: Solve for x
   x = 74,023,976.33/3,619.69
6. Step 6: Final answer
   x = 20,450.38