Finding the Third Proportional to 20,856 and 43,438.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,856 : 43,438.50 = 43,438.50 : x
2. Step 2: Convert to fraction form
   20,856/43,438.50 = 43,438.50/x
3. Step 3: Cross multiply
   20,856x = 43,438.50 × 43,438.50
4. Step 4: Simplify right side
   20,856x = 1,886,903,282.25
5. Step 5: Solve for x
   x = 1,886,903,282.25/20,856
6. Step 6: Final answer
   x = 90,472.92