Finding the Third Proportional to 25,390 and 55,640

Step by Step Solution

1. Step 1: Write the proportion equation
   25,390 : 55,640 = 55,640 : x
2. Step 2: Convert to fraction form
   25,390/55,640 = 55,640/x
3. Step 3: Cross multiply
   25,390x = 55,640 × 55,640
4. Step 4: Simplify right side
   25,390x = 3,095,809,600
5. Step 5: Solve for x
   x = 3,095,809,600/25,390
6. Step 6: Final answer
   x = 121,930.27