Finding the Third Proportional to 3,667.50 and 8,590.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,667.50 : 8,590.50 = 8,590.50 : x
2. Step 2: Convert to fraction form
   3,667.50/8,590.50 = 8,590.50/x
3. Step 3: Cross multiply
   3,667.50x = 8,590.50 × 8,590.50
4. Step 4: Simplify right side
   3,667.50x = 73,796,690.25
5. Step 5: Solve for x
   x = 73,796,690.25/3,667.50
6. Step 6: Final answer
   x = 20,121.80