Finding the Third Proportional to 21,168 and 45,990

Step by Step Solution

1. Step 1: Write the proportion equation
   21,168 : 45,990 = 45,990 : x
2. Step 2: Convert to fraction form
   21,168/45,990 = 45,990/x
3. Step 3: Cross multiply
   21,168x = 45,990 × 45,990
4. Step 4: Simplify right side
   21,168x = 2,115,080,100
5. Step 5: Solve for x
   x = 2,115,080,100/21,168
6. Step 6: Final answer
   x = 99,918.75