Finding the Third Proportional to 20,115 and 31,131

Step by Step Solution

1. Step 1: Write the proportion equation
   20,115 : 31,131 = 31,131 : x
2. Step 2: Convert to fraction form
   20,115/31,131 = 31,131/x
3. Step 3: Cross multiply
   20,115x = 31,131 × 31,131
4. Step 4: Simplify right side
   20,115x = 969,139,161
5. Step 5: Solve for x
   x = 969,139,161/20,115
6. Step 6: Final answer
   x = 48,179.92