Finding the Third Proportional to 25,400 and 55,978

Step by Step Solution

1. Step 1: Write the proportion equation
   25,400 : 55,978 = 55,978 : x
2. Step 2: Convert to fraction form
   25,400/55,978 = 55,978/x
3. Step 3: Cross multiply
   25,400x = 55,978 × 55,978
4. Step 4: Simplify right side
   25,400x = 3,133,536,484
5. Step 5: Solve for x
   x = 3,133,536,484/25,400
6. Step 6: Final answer
   x = 123,367.58