Finding the Third Proportional to 12,451.50 and 20,931.75

Step by Step Solution

1. Step 1: Write the proportion equation
   12,451.50 : 20,931.75 = 20,931.75 : x
2. Step 2: Convert to fraction form
   12,451.50/20,931.75 = 20,931.75/x
3. Step 3: Cross multiply
   12,451.50x = 20,931.75 × 20,931.75
4. Step 4: Simplify right side
   12,451.50x = 438,138,158.06
5. Step 5: Solve for x
   x = 438,138,158.06/12,451.50
6. Step 6: Final answer
   x = 35,187.58