Finding the Third Proportional to 12,139.50 and 25,121.75

Step by Step Solution

1. Step 1: Write the proportion equation
   12,139.50 : 25,121.75 = 25,121.75 : x
2. Step 2: Convert to fraction form
   12,139.50/25,121.75 = 25,121.75/x
3. Step 3: Cross multiply
   12,139.50x = 25,121.75 × 25,121.75
4. Step 4: Simplify right side
   12,139.50x = 631,102,323.06
5. Step 5: Solve for x
   x = 631,102,323.06/12,139.50
6. Step 6: Final answer
   x = 51,987.51