Finding the Third Proportional to 15,856.75 and 20,855.50

Step by Step Solution

1. Step 1: Write the proportion equation
   15,856.75 : 20,855.50 = 20,855.50 : x
2. Step 2: Convert to fraction form
   15,856.75/20,855.50 = 20,855.50/x
3. Step 3: Cross multiply
   15,856.75x = 20,855.50 × 20,855.50
4. Step 4: Simplify right side
   15,856.75x = 434,951,880.25
5. Step 5: Solve for x
   x = 434,951,880.25/15,856.75
6. Step 6: Final answer
   x = 27,430.08