Finding the Third Proportional to 20,310 and 42,245

Step by Step Solution

1. Step 1: Write the proportion equation
   20,310 : 42,245 = 42,245 : x
2. Step 2: Convert to fraction form
   20,310/42,245 = 42,245/x
3. Step 3: Cross multiply
   20,310x = 42,245 × 42,245
4. Step 4: Simplify right side
   20,310x = 1,784,640,025
5. Step 5: Solve for x
   x = 1,784,640,025/20,310
6. Step 6: Final answer
   x = 87,870.02