Finding the Third Proportional to 12,939.75 and 20,275.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,939.75 : 20,275.31 = 20,275.31 : x
2. Step 2: Convert to fraction form
   12,939.75/20,275.31 = 20,275.31/x
3. Step 3: Cross multiply
   12,939.75x = 20,275.31 × 20,275.31
4. Step 4: Simplify right side
   12,939.75x = 411,088,296.97
5. Step 5: Solve for x
   x = 411,088,296.97/12,939.75
6. Step 6: Final answer
   x = 31,769.42