Finding the Third Proportional to 12,399.75 and 26,239.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,399.75 : 26,239.50 = 26,239.50 : x
2. Step 2: Convert to fraction form
   12,399.75/26,239.50 = 26,239.50/x
3. Step 3: Cross multiply
   12,399.75x = 26,239.50 × 26,239.50
4. Step 4: Simplify right side
   12,399.75x = 688,511,360.25
5. Step 5: Solve for x
   x = 688,511,360.25/12,399.75
6. Step 6: Final answer
   x = 55,526.23