Finding the Third Proportional to 12,912.75 and 20,621.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,912.75 : 20,621.25 = 20,621.25 : x
2. Step 2: Convert to fraction form
   12,912.75/20,621.25 = 20,621.25/x
3. Step 3: Cross multiply
   12,912.75x = 20,621.25 × 20,621.25
4. Step 4: Simplify right side
   12,912.75x = 425,235,951.56
5. Step 5: Solve for x
   x = 425,235,951.56/12,912.75
6. Step 6: Final answer
   x = 32,931.48