Finding the Third Proportional to 25,678 and 56,390

Step by Step Solution

1. Step 1: Write the proportion equation
   25,678 : 56,390 = 56,390 : x
2. Step 2: Convert to fraction form
   25,678/56,390 = 56,390/x
3. Step 3: Cross multiply
   25,678x = 56,390 × 56,390
4. Step 4: Simplify right side
   25,678x = 3,179,832,100
5. Step 5: Solve for x
   x = 3,179,832,100/25,678
6. Step 6: Final answer
   x = 123,834.88