Finding the Third Proportional to 20,128.50 and 31,918.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,128.50 : 31,918.50 = 31,918.50 : x
2. Step 2: Convert to fraction form
   20,128.50/31,918.50 = 31,918.50/x
3. Step 3: Cross multiply
   20,128.50x = 31,918.50 × 31,918.50
4. Step 4: Simplify right side
   20,128.50x = 1,018,790,642.25
5. Step 5: Solve for x
   x = 1,018,790,642.25/20,128.50
6. Step 6: Final answer
   x = 50,614.34