Finding the Third Proportional to 21,672 and 28,309.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,672 : 28,309.50 = 28,309.50 : x
2. Step 2: Convert to fraction form
   21,672/28,309.50 = 28,309.50/x
3. Step 3: Cross multiply
   21,672x = 28,309.50 × 28,309.50
4. Step 4: Simplify right side
   21,672x = 801,427,790.25
5. Step 5: Solve for x
   x = 801,427,790.25/21,672
6. Step 6: Final answer
   x = 36,979.87