Finding the Third Proportional to 12,408.19 and 20,839.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,408.19 : 20,839.78 = 20,839.78 : x
2. Step 2: Convert to fraction form
   12,408.19/20,839.78 = 20,839.78/x
3. Step 3: Cross multiply
   12,408.19x = 20,839.78 × 20,839.78
4. Step 4: Simplify right side
   12,408.19x = 434,296,482.55
5. Step 5: Solve for x
   x = 434,296,482.55/12,408.19
6. Step 6: Final answer
   x = 35,000.80