Finding the Third Proportional to 20,121 and 42,911

Step by Step Solution

1. Step 1: Write the proportion equation
   20,121 : 42,911 = 42,911 : x
2. Step 2: Convert to fraction form
   20,121/42,911 = 42,911/x
3. Step 3: Cross multiply
   20,121x = 42,911 × 42,911
4. Step 4: Simplify right side
   20,121x = 1,841,353,921
5. Step 5: Solve for x
   x = 1,841,353,921/20,121
6. Step 6: Final answer
   x = 91,514.04