Finding the Third Proportional to 8,325.39 and 12,390.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,325.39 : 12,390.78 = 12,390.78 : x
2. Step 2: Convert to fraction form
   8,325.39/12,390.78 = 12,390.78/x
3. Step 3: Cross multiply
   8,325.39x = 12,390.78 × 12,390.78
4. Step 4: Simplify right side
   8,325.39x = 153,531,311.76
5. Step 5: Solve for x
   x = 153,531,311.76/8,325.39
6. Step 6: Final answer
   x = 18,441.34