Finding the Third Proportional to 12,399 and 30,576

Step by Step Solution

1. Step 1: Write the proportion equation
   12,399 : 30,576 = 30,576 : x
2. Step 2: Convert to fraction form
   12,399/30,576 = 30,576/x
3. Step 3: Cross multiply
   12,399x = 30,576 × 30,576
4. Step 4: Simplify right side
   12,399x = 934,891,776
5. Step 5: Solve for x
   x = 934,891,776/12,399
6. Step 6: Final answer
   x = 75,400.58