Finding the Third Proportional to 12,890 and 30,245

Step by Step Solution

1. Step 1: Write the proportion equation
   12,890 : 30,245 = 30,245 : x
2. Step 2: Convert to fraction form
   12,890/30,245 = 30,245/x
3. Step 3: Cross multiply
   12,890x = 30,245 × 30,245
4. Step 4: Simplify right side
   12,890x = 914,760,025
5. Step 5: Solve for x
   x = 914,760,025/12,890
6. Step 6: Final answer
   x = 70,966.64