Finding the Third Proportional to 20,426.50 and 28,128.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,426.50 : 28,128.50 = 28,128.50 : x
2. Step 2: Convert to fraction form
   20,426.50/28,128.50 = 28,128.50/x
3. Step 3: Cross multiply
   20,426.50x = 28,128.50 × 28,128.50
4. Step 4: Simplify right side
   20,426.50x = 791,212,512.25
5. Step 5: Solve for x
   x = 791,212,512.25/20,426.50
6. Step 6: Final answer
   x = 38,734.61