Finding the Third Proportional to 20,856.75 and 43,439.25

Step by Step Solution

1. Step 1: Write the proportion equation
   20,856.75 : 43,439.25 = 43,439.25 : x
2. Step 2: Convert to fraction form
   20,856.75/43,439.25 = 43,439.25/x
3. Step 3: Cross multiply
   20,856.75x = 43,439.25 × 43,439.25
4. Step 4: Simplify right side
   20,856.75x = 1,886,968,440.56
5. Step 5: Solve for x
   x = 1,886,968,440.56/20,856.75
6. Step 6: Final answer
   x = 90,472.79