Finding the Third Proportional to 25,878 and 54,990

Step by Step Solution

1. Step 1: Write the proportion equation
   25,878 : 54,990 = 54,990 : x
2. Step 2: Convert to fraction form
   25,878/54,990 = 54,990/x
3. Step 3: Cross multiply
   25,878x = 54,990 × 54,990
4. Step 4: Simplify right side
   25,878x = 3,023,900,100
5. Step 5: Solve for x
   x = 3,023,900,100/25,878
6. Step 6: Final answer
   x = 116,852.16